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1) If B is between A and C, AB=10 and AC=28, what is the value of BC?

9

18

19

38

2) If B is between A and C, AB=6x, BC=8x and AC=42, what is the value of x?

3

14

18

24

3) If B is between A and C, AB=2x-1, BC=3x+5 and AC=24, what is the value of AB?

4

7

12

17

+3
Answers (1)
  1. 3 May, 08:33
    0
    One

    AB + BC = 28

    AB = 10

    10 + BC = 28

    BC = 28 - 10

    BC = 18

    Two

    AB + BC = AC

    AB = 6x

    BC = 8x

    6x + 8x = 42

    14x = 42

    x = 42/14 = 3

    Three

    AB = 2x - 1

    BC = 3x + 5

    AB + BC = 24

    2x - 1 + 3x + 5 = 24

    5x + 4 = 24

    5x = 24 - 4

    5x = 20

    x = 20/5

    x = 4

    AB = 2x - 1

    AB = 2*4 - 1

    AB = 7
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