# Mathematics Grade 12 Paper 1 Free State Prelim 2024 Memo

> Grade 12 Mathematics Paper 1 memorandum from the Free State Prelim Exam 2024, 15 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/fs-gr-12-sept-2024-p1-memo/7c5ea9c7-a4b2-41fe-9f96-ffc778d7f250
- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2024
- Exam period: Free State Prelim Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 15

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### Page 1

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                PREPARATORY EXAMINATION
                 VOORBEREIDENDE EKSAMEN

                                GRADE/GRAAD 12

                          MATHEMATICS P1
                           WISKUNDE V1

                                SEPTEMBER 2024

                              MARKS/PUNTE: 150

                         MARKING GUIDELINES
                           NASIENRIGLYNE

                           These marking guidelines consist of 15pages.
                           Hierdie nasienriglyne bestaan uit 15 bladsye.

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Mathematics P1/Wiskunde V1                          2                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

NOTE:
• If a candidate answered a question TWICE, mark only the FIRST attempt.
• If a candidate has crossed out an attempt to answer a question and did not redo it, mark the
  crossed-out version.
• Consistent accuracy applies in ALL aspects of the marking guideline.
• Assuming answers/values to solve a problem is UNACCEPTABLE.

NOTA:
• As 'n kandidaat 'n vraag TWEE KEER beantwoord, sien slegs die EERSTE poging na.
• As 'n kandidaat 'n antwoord van 'n vraag doodtrek en nie oordoen nie, sien die
   doodgetrekte poging na.
• Volgehoue akkuraatheid word in ALLE aspekte van die nasienriglyne toegepas.
• Om antwoorde/waardes aan te neem om 'n probleem op te los, is ONAANVAARBAAR.

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Mathematics P1/Wiskunde V1                           3                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.    Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 1

  1.1.1 𝑥 = 7 𝑜𝑟 𝑥 = −10                                                  ✓ 𝑥=7
                                                                          ✓ 𝑥 = −10
                                                                                                     (2)
  1.1.2 3𝑥(2𝑥 + 1) = 1
        6𝑥 2 + 3𝑥 − 1 = 0
             −𝑏 ± √𝑏 2 − 4𝑎𝑐                                              ✓ standard form
        𝑥=
                   2𝑎
             −3 ± √(3)2 − 4(6)(−1)
        𝑥=                                                                ✓ substitution into
                      2(6)                                                  correct formula
                    −3±√33
          𝑥=             12
           𝑥 = 0,23 or 𝑥 = −0,73                                          ✓ 𝑥 = 0,23
                                                                          ✓ 𝑥 = −0,73
                                        OR/OF
                                                                                                     (4)
                                                                                   OR
              2
          6𝑥 + 3𝑥 − 1 = 0
               1     1 1 1                                                 standard form
          𝑥2 + 𝑥 + = +
               2     4 6 4
              1 2     5
          (𝑥 + ) =                                                                   1       5
              2      12                                                    (𝑥 + 2)2 = 12
              −3 ± √33
          𝑥=
                  12                                                      ✓ 𝑥 = 0,23
           𝑥 = 0,23 or 𝑥 = −0,73                                          ✓ 𝑥 = −0,73

                                                                                                     (4)
              2
  1.1.3 6𝑥 + 7𝑥 + 2 ≥ 0
        (3𝑥 + 2)(2𝑥 + 1) ≥ 0                                              ✓ factors/CV’s
               2       1
        C/V − & −
               3       2                                    1
              2          1
        𝑥 ≤ − 3 𝑜𝑟 𝑥 ≥ − 2                  And then max                  ✓✓ answers (combo
                                                            3                marks)
                                                                                                     (3)
  1.1.4           2x + x = 2

          (                  ) = ( 2 )2
                              2
                  2x + x                                                  ✓ squaring both sides

              2x + x = 4

          ( 2x ) = ( 4 − x)
                    2              2

                                                                          ✓ squaring both sides
           2 x = 16 - 8 x + x 2
                                                                          ✓ standard form
           x − 10 x + 16 = 0
              2

          ( x − 2 ) ( x − 8) = 0                                          ✓ factors
           x=2          or    x =8                                        ✓ answers (with
                             x8                                            selection)
                                                                                                     (5)
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Mathematics P1/Wiskunde V1                          4                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

  1.2     −2𝑦 + 𝑥 = 4 𝑎𝑛𝑑 𝑥 2 + 𝑥𝑦 − 2𝑦 2 = 0
          𝑥 = 2𝑦 + 4                                                     ✓ 𝑥 = 2𝑦 + 4

          𝑥 2 + 𝑥𝑦 − 2𝑦 2 = 0
          (2𝑦 + 4)2 + 𝑦(2𝑦 + 4) − 2𝑦 2 = 0                               ✓ substitution
          4𝑦 2 + 16𝑦 + 16 + 2𝑦 2 + 4𝑦 − 2𝑦 2 = 0
          4𝑦 2 + 20𝑦 + 16 = 0
          𝑦 2 + 5𝑦 + 4 = 0                                               ✓ standard form
          (𝑦 + 1)(𝑦 + 4) = 0
          𝑦 = −1 𝑜𝑟 𝑦 = −4                                               ✓ both y values

          𝑥 = 2(−1) + 4 𝑜𝑟 𝑥 = 2(−4) + 4
          𝑥 = 2 𝑜𝑟 𝑥 = −4                                                ✓ both x values
                                                                                                    (5)
            𝑚        2𝑚−1 )
  1.3     4 = 𝑝(2        +𝑝
                     2𝑚
                𝑝. 2
          22𝑚 =         +𝑝                                                            𝑝.22𝑚
                   2                                                     ✓ 22𝑚 =              +𝑝
                                                                                        2
                𝑝. 22𝑚
          22𝑚 −         =𝑝
                   2
                   𝑝
          22𝑚 (1 − ) = 𝑝                                                 ✓ Factorisation
                    2
                   2𝑚
                                 𝑝
            ∴     2 = 𝑝 ÷ (1 − )
                                 2
                  2𝑚
                         2𝑝
                2 =                                                      ✓ simplification:
                        2−𝑝
                             2𝑝
                2𝑚 = 𝑙𝑜𝑔2 (      )                                       ✓ log form
                            2−𝑝
                       1      2𝑝
                 𝑚 = 𝑙𝑜𝑔2 (        )                                                                (4)
                       2     2−𝑝
                                                                                                   [23]

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Mathematics P1/Wiskunde V1                                   5                                  FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.            Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 2

 2.1.
                   ...   ;        ...    ;          0        ;       7;            12
          ;

                                                                                         ✓First differences
                             11              9                   7             5

                                        –2              –2                –2

                                                                                         ✓ 𝑇1 = −20
          𝑇1 = −20                                                                                                 (2)

 2.2       2 a = −2
           a = −1                                                                        𝑎 = −1
           3a + b = 11
           3(−1) + b = 11
           b = 14                                                                        𝑏 = 14
           a + b + c = −20                          Answer only: full
           −1 + 14 + c = −20                        marks
           c = −33                                                                       𝑐 = −33
                                                                                          𝑇𝑛 = −𝑛2 + 14𝑛 − 33
           Tn = − n + 14n − 33
                         2

                                                                                                                    (4)
 2.3       Tn = −n + 14n − 33
                         2

               −14
           n=                                                                              method
              2(−1)
                                                   Answer only: full                     𝑛=7                      (3)
          n=7
          Max value= 16                            marks
          T7 =16

                                                 OR/OF
           T = −2n + 14
              n
               /

           0 = −2n + 14                                                                    method
          n = 7                                                                         𝑛=7
          n=7
          T7 =16 WILL HAVE THE HIGHEST VALUE
                                                                                                                   (3)
                                                                                                                   [9]

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Mathematics P1/Wiskunde V1                          6                              FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 3

  3.1.1    (2𝑥 + 4) − (10𝑥 + 6) = (4𝑥 − 8) − (2𝑥 + 4)                    equating
           −8𝑥 − 2 = 2𝑥 − 12
           −10𝑥 = −10
           𝑥=1                                                           𝑥=1                       (2)
  3.1.2    16: 6: −4                                                      sequence
           𝑇10 = 16 + (10 − 1)(−10)                                       substitution
           = −74
                                                                          answer
                                                                                                    (3)
  3.1.3          99                                                       substitution
           𝑆99 =    [2(16) + (99 − 1)(−10)]
                  2                                                       answer
           = −46926
                                                                                                    (2)
  3.2.1    𝑟 =𝑘−5                                                         Common ratio

           −1 < 𝑘 − 5 < 1                                                 substitution

           4<𝑘<6                                                          answer                   (3)
  3.2.2                        1                                          a and r
           𝑎 = −1 or 𝑟 = − 2

                      −1
           𝑆∞ =            1
                    1 − (− )                                              substitution
                           2

                2
           =−                                                             answer
                3                                                                                   (3)
  3.3      𝑥; 3𝑥; 10𝑥 − 20                                                Sequence in terms of x

           10𝑥 − 20 3𝑥
                    =                                                     ratio
              3𝑥       𝑥
           10𝑥 − 20 = 9𝑥
           𝑥 = 20                                                         x = 20
           20; 60; 200
                                                                          numbers
                                                                                                    (4)
                                                                                                   [17]

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Mathematics P1/Wiskunde V1                           7                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.    Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 4

  4.1     g ( x) = k x
                                                                           substitution
         3 = k1
                                                                           𝑘=3
         k = 3
                                                                                                     (2)
  4.2    𝑥=0                                                               𝑥=0
         𝑦 = −1                                                            𝑦 = −1
                                                                                                     (2)
  4.3     g ( x ) = 3x
                                                                           interchange
          x = 3y                       Answer only: full
                                        marks
          g −1( x ) = log 3x
                                                                           answer
                                                                                                     (2)
  4.4        −2                                                            𝑦=0
         0=     −1
             𝑥
             −2
         1=
             𝑥
         𝑥 = −2                                                            𝑥 = −2
                                                                                                     (2)
  4.5
                                                                                       𝑓(𝑥)
                                                                           asymptote
                                                                           x-intercept
                                                                           shape (Q2 and Q4)

                                                                                     𝑔(𝑥)−1
                                                                           x- intercept
                                                                           increasing shape

                                                                                                     (5)

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Mathematics P1/Wiskunde V1                          8                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

 4.6     𝑦 = −(𝑥 + 𝑝) + 𝑞
         𝑦 = −(𝑥 + 0) − 1                                                 𝑦 = −𝑥 − 1
         𝑦 = −𝑥 − 1
         −2
            −1 = −x −1                                                    equating
          x
         −2 − x = − x 2 − x
          x2 = 2
                                                                         Simplification
         x =  2                                                        both answers             (4)

         OR/OF

          y = −x + c
         −1 = −(0) + c
          c = −1
          y = −x −1
         −2                                                               𝑦 = −𝑥 − 1
            −1 = −x −1
          x                                                               equating
         −2 − x = − x 2 − x
          x2 = 2                                                         x 2 = 2 Simplification
         x =  2                                                        both answers         (4)
 4.7     −2 < 𝑥 ≤ 1                                                      ✓✓ answer
                                                                                                (2)
                                                                                                   [19]

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Mathematics P1/Wiskunde V1                          9                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 5

  5.1      −𝑥 2 − 𝑥 + 12 = 0                                                𝑓(𝑥) = 0
           𝑥 2 + 𝑥 − 12 = 0
           (𝑥 + 4)(𝑥 − 3) = 0                                               factors
           𝑥 = −4 or 𝑥 = 3                                                  both 𝑥 values
                                                                                                      (3)
           A(−4;0)
           B (3;0)
  5.2               𝑏     −1
          𝑥=−         =−
                   2𝑎    2(−1)
               1
          =−                                                                𝑥 − value
               2
                                  2
                1        1      1
          ∴ 𝑓 (− ) = − (− ) − (− ) + 12
                2        2      2                                           𝑦 − value
            49
          =
             4                                                              Answer
                49
          ∴𝑦≤
                 4
                             OR/OF

               −4 + 3
          𝑥=
                  2
               1                                                            𝑥 − value
          =−
               2
                 1       1 2    1
          ∴ 𝑓 (− ) = − (− ) − (− ) + 12
                 2       2      2
            49
          =                                                                 𝑦 − value
             4
                 49
          ∴𝑦≤                                                               Answer
                  4
                                                                                                      (3)
                     49
  5.3     𝑘(𝑥) = 3   4
                        −12                                                 𝑠𝑢𝑏𝑠𝑡

          = 30.25
          = 1,32                                                            Answer
                                                                                                      (2)

  5.4     𝑥 < −4 or 0 < 𝑥 < 3                                               𝑥 < −4
                                                                           0<𝑥<3
                                                                                                      (2)

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Mathematics P1/Wiskunde V1                          10                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

 5.5        −1
             < 12 − 𝑘 < 0
 Check      4
 Afr              49                                                       Answer
         12 < 𝑘 <
                   4
                                                                                                      (2)
 5.6                 5     49                                                         5 2
         ℎ(𝑥) = −(𝑥 − )2 +                                                −(𝑥 − 2)
                     2      4                                                 49
                                                                           4
                                                                                                     (2)
                                                                                                    [14]

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Mathematics P1/Wiskunde V1                                  11                            FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.           Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 6

  6.1     𝐴 = 150 000(1 − 0,13)6                                               correct substitution in
                                                                               correct formula
          = 𝑅65 043,93                                                        𝑛 = 6 & 𝑖 = 0,13
                                                                               Answer

                                                                                                            (3)

  6.2.1                    0.053 2                                             4 and 2
          𝐴 = 300 000 (1 +      )                                              correct substitution in
                             4
                                                                                correct formula
          = 𝑅308 002,67                                                        Answer
                                                                                                            (3)

  6.2.2                                          0,053 −72                     correct substitution in
                           𝑥 [1 − (1 +                )      ]
                                                  4                            correct formula
          308 002,67 =                   0,053
                                             4
                                 0,053
                308 002,67 ×                                                   Simplification
                                  4
          𝑥=                     −72
                           0,053
               [1 − (1 +         )       ]
                             4

          𝑥 = 𝑅6 664,20                                                        Answer

                                                                                                            (3)
  6.3                                    12
                         0.079
          1 + 𝑖𝑒𝑓𝑓 = (1 +      )
                          12
          𝑖𝑒𝑓𝑓 = 0,01321000694                                                answer

                                                  𝑖𝑛𝑜𝑚 4
          1 + 0,01321000694 = (1 +                    )
                                                    4                         answer
          𝑖𝑛𝑜𝑚 = 0,01314506756
                                                                              answer
          Quarterly deposit= 27562.50 × 0.11 = 3031,88
                                                                              32
                                 0,01314506756 32
                3031,88 [(1 +          4
                                                      )      − 1]              Correct substitution into
          𝐹=                 0,01314506756                                     the future value annuity
                                     4
          𝐹 = 𝑅 102 128,44                                                    Answer

                                                                                                            (6)
                                                                                                           [15]

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Mathematics P1/Wiskunde V1                          12                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 7

  7.1     𝑓(𝑥) = −1 + 4𝑥 2
                        𝑓(𝑥 + ℎ) − 𝑓(𝑥)
          𝑓 ′ (𝑥) = lim
                    ℎ→0        ℎ
                  −1 + 4𝑥 2 + 8𝑥ℎ + 4ℎ2 − (−1 + 4𝑥 2 )                ✓𝑓(𝑥 + ℎ) = −1 + 4𝑥 2 +
          = lim                                                       8𝑥ℎ + 4ℎ2
              ℎ→0                  ℎ
                  8𝑥ℎ + 4ℎ2                                           ✓ substitution
          = lim                                                       ✓ simplification
              ℎ→0     ℎ
                  ℎ(8𝑥 + 4ℎ)
          = lim                                                        ✓ common factor
              ℎ→0      ℎ
          = lim (8𝑥 + 4ℎ)
             ℎ→0
                                                                      ✓ answer
          = 8𝑥

                                   OR/OF
                                                                      ✓𝑓(𝑥 + ℎ) = −1 + 4𝑥 2 +
          𝑓(𝑥 + ℎ) = −1 + 4(𝑥 + ℎ)2
          = −1 + 4𝑥 2 + 8𝑥ℎ + 4ℎ2                                     8𝑥ℎ + 4ℎ2

                      𝑓(𝑥 + ℎ) − 𝑓(𝑥)
          𝑓 ′ (𝑥) = lim
                  ℎ→0        ℎ
                −1 + 4𝑥 2 + 8𝑥ℎ + 4ℎ2 − (−1 + 4𝑥 2 )                  ✓ substitution
          = lim
            ℎ→0                  ℎ
                8𝑥ℎ + 4ℎ2
          = lim                                                       ✓ simplification
            ℎ→0     ℎ
                ℎ(8𝑥 + 4ℎ)
          = lim                                                        ✓common factor
            ℎ→0      ℎ
          = lim (8𝑥 + 4ℎ)
             ℎ→0
          = 8𝑥                                                        ✓ answer

                                                                                                    (5)
  7.2.1    𝐷𝑥 [(2𝑥 3 + 5)2 ]
           = 𝐷𝑥 [4𝑥 6 + 20𝑥 3 + 25]                                   ✓ expansion
           = 24𝑥 5 + 60𝑥 2                                            ✓ 24𝑥 5
                                                                      ✓ 60𝑥 2
                                                                                                    (3)
                        7      3
  7.2.2    𝑦 = 3𝑥 4 − + 2. √𝑥 2                                                           2
                        𝑥
                                    2
                                                                      ✓ −7𝑥 −1 + 2𝑥 3
           𝑦 = 3𝑥 4 − 7𝑥 −1 + 2𝑥 3                                    ✓ 12𝑥 3
           𝑑𝑦       3      −2   4 −1
              = 12𝑥   + 7𝑥    +   𝑥 3
           𝑑𝑥                   3                                     ✓ 7𝑥 −2
                                                                          4    1
                                                                      ✓ 3 𝑥 −3
                                                                                                    (4)

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Mathematics P1/Wiskunde V1                           13                            FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.    Marking Guidelines/Nasienriglyne

  7.3      𝑦 + 5𝑥 = 4
           𝑦 = −5𝑥 + 4
           𝑚𝑇 = 5
                 1                                                       ✓ gradient of tangent

           𝑦 = 2𝑥 2 + 3𝑥 + 1
           𝑑𝑦
              = 4𝑥 + 3
           𝑑𝑥
                           1                                                              1
           4𝑥 + 3 = 5                                                    ✓ 4𝑥 + 3 = 5
                      14
           4𝑥 = − 5
                −14
           𝑥 = 20                                                        ✓ x value
                    7
           𝑥 = − 10
                           7 2          7
           𝑦 = 2 (− 10) + 3 (− 10) + 1
                    3
           𝑦 = − 25                                                      ✓ y value
                7       3                                                                            (4)
           (− 10 ; − 25)
                                                                                                    [16]

QUESTION/VRAAG 8

  8.1     𝑓(𝑥) = −3𝑥 3 + 15𝑥 2 − 21𝑥 + 9
          x intercepts
           (𝑥 − 1)(−3𝑥 2 + 12𝑥 − 9) = 0                                        ✓ 𝑦=0
           𝑥 − 1 = 0 𝑜𝑟 𝑥 2 − 4𝑥 + 3 = 0
           𝑥 − 1 = 0 𝑜𝑟 (𝑥 − 1)(𝑥 − 3) = 0                                     ✓ factors
           𝑥 = 1 𝑜𝑟 𝑥 = 3                                                      ✓ Both x- values
          y intercept
           𝑦=9
          (0; 9)                                                               ✓ (0; 9)
                                                                                                     (4)
                               3   2
  8.2     𝑓(𝑥) = −3𝑥 + 15𝑥 − 21𝑥 + 9
          𝑓 ′ (𝑥) = −9𝑥 2 + 30𝑥 − 21
          −9𝑥 2 + 30𝑥 − 21 = 0                                                 ✓ −9𝑥 2 + 30𝑥 − 21
          3𝑥 2 − 10𝑥 + 7 = 0
          (3𝑥 − 7)(𝑥 − 1) = 0                                                  ✓ f / ( x) = 0
                 7                                                             ✓ both x- values
          𝑥 = 𝑜𝑟 𝑥 = 1
                 3
               7        7 3       7 2   7
          𝑓 ( ) = −3 ( ) + 15 ( ) − 21 ( ) + 9
               3        3         3     3
                     32                         7 32
                   = 9                         (3 ; 9 )

                                                                               ✓ both y values
          𝑓(1) = −3(1)3 + 15(1)2 − 21(1) + 9
                                                                                                     (4)
               =0                                           (1; 0)

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### Page 14

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Mathematics P1/Wiskunde V1                          14                             FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

  8.3

                                                                              ✓y- intercept
                                                                               both x -intercepts
                                                                               both turning points
                                                                               shape

                                                                                                     (4)

  8.4.1      7             7                                                  ✓✓ answer (combo
          (1; ) 𝑜𝑟 1 < 𝑥 <
             3             3                                                     mark)
                                                                                             (2)
  8.4.2             32                                                        ✓✓ answer (combo
          0<𝑘<
                     9                                                           mark)

                                                                                                    (2)
                                                                                                   [16]

QUESTION/VRAAG 9

  9.1     let x be the number of R20 increases in price
                                                                        𝑃𝑟𝑖𝑐𝑒 = 400 + 2𝑥
          𝑃𝑟 𝑖 𝑐𝑒 = 400 + 20𝑥

          𝑄𝑢𝑎𝑛𝑡𝑖𝑡𝑦 = 200 − 4𝑥                                           𝑞𝑢𝑎𝑛𝑡𝑖𝑡𝑦 = 200 − 4𝑥

          𝑃𝑟𝑜𝑓𝑖𝑡 = (400 + 20𝑥)(200 − 4𝑥)                                Profit
                                                                          = 80 000 − 2 400𝑥 − 80𝑥 2
          = 80 000 + 2 400𝑥 − 80𝑥 2

          𝑑𝑟
             =0
          𝑑𝑥                                                              𝑑𝑟
          2400 − 160𝑥 = 0                                              ✓ 𝑑𝑥 = 2 400 − 160𝑥
                                                                         𝑑𝑟
                                                                       ✓𝑑𝑥 = 0
          160𝑥 = 2 400
          𝑥 = 15
                                                                       𝑥 = 15
          𝑝𝑟𝑖𝑐𝑒 = 400 + 20(15)
                                                                        𝑅700
                = 𝑅700
                                                                                                     (7)
                                                                                                     [7]
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Mathematics P1/Wiskunde V1                          15                            FS/VS/September 2024
Grade/Graad 12 Prep. Exam./Voorb. Eksam.   Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 10
 10.1.1 𝑃(𝐴 𝑜𝑟 𝐵) = 𝑃(𝐴) + 𝑃(𝐵)                                       ✓ 0,8 = 𝑃(𝐴) + 0,4
        0,8 = 𝑃(𝐴) + 0,4
        𝑃(𝐴) = 0,4                                                    ✓ answer
                                                                                                    (2)
  10.1.2 𝑃(𝐴 𝑜𝑟 𝐵) = 𝑃(𝐴) + 𝑃(𝐵) − 𝑃(𝐴) × 𝑃(𝐵)
         0,8 = 𝑃(𝐴) + 0,4 − 0,4𝑃(𝐴)                                   ✓Substitution
         0,6𝑃(𝐴) = 0,4
                2
         𝑃(𝐴) =                                                                   2
                3                                                     ✓𝑃(𝐴) = 3
                                                                                                    (2)
  10.2                                                                ✓𝑥 𝑎𝑛𝑑 1 − 𝑥
                                                                      ✓0,9 𝑎𝑛𝑑 0,1
                                                                      ✓0,05 𝑎𝑛𝑑 0,95

                      𝑃(𝐷 𝑃) + 𝑃(𝑁𝐷 𝑃) = 0,067
                      0,9𝑥 + 0,05(1 − 𝑥) = 0,067                      ✓Substitution
                     0,9𝑥 + 0,05 − 0,05𝑥 = 0,067
                                                                      ✓Simplification
                             0,85 𝑥 = 0,017
                                𝑥 = 0,02
                  2% of the population has the disease.
                                                                      ✓Answer                       (6)
  10.3.1 21 × 20 × 19 × 10 × 9 × 8                                    ✓ 21 × 20 × 19 × 10 × 9 × 8
         = 5745600
                                                                                                    (1)
  10.3.2 NO REPEATS

           P(starting with a 6)                                       ✓ 21 × 20 × 19 × 1 × 9 × 8
                            21 × 20 × 19 × 1 × 9 × 8                  ✓ 21 × 20 × 19 × 10 × 9 × 8
                         =                                             1
                            21 × 20 × 19 × 10 × 9 × 8                 ✓10
                            1
                         = 10
                                                                                                    (3)
           REPEATS
           P(starting with a 6)
                             21 × 21 × 21 × 1 × 10 × 10               ✓ 21 × 21 × 21 × 1 × 10 × 10
                         =                                            ✓ 21 × 21 × 21 × 10 × 10 × 10
                            21 × 21 × 21 × 10 × 10 × 10                1
                            1
                         = 10                                         ✓10
                                                                                                  (3)
                                                                                                 [14]

                                                                              TOTAL/TOTAAL: 150

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