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21 February, 20:08

1. Solve proportion 12/15 = 18/b

2. Solve equations

A. - x + 4 = x + 6

B. 5n + 7 = 7 (n+1) - 2n

C. - 4 (p+2) + 8 = 2 (p-1) - 7p + 15

3. Solve a/b x - c = 0 for x

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Answers (1)
  1. 21 February, 20:18
    0
    We solve the as follows:

    1. Solve proportion 12/15 = 18/b

    (12/15 = 18/b) b

    (12b/15 = 18) 15/12

    b = 18 (15/12)

    b = 45/2

    2. Solve equations

    A. - x + 4 = x + 6

    -x + 4 - x = x + 6 - x

    -2x + 4 - 4 = 6 - 4

    -2x = 2

    x = - 1

    B. 5n + 7 = 7 (n+1) - 2n

    5n + 7 = 7n + 7 - 2n

    5n - 7n + 2n = 7 - 7

    0 = 0

    C. - 4 (p+2) + 8 = 2 (p-1) - 7p + 15

    -4p - 8 + 8 = 2p - 2 - 7p + 15

    -4p + 7p - 2p = - 2 + 15 + 8 - 8

    p = 13

    3. Solve a/b x - c = 0 for x

    a/b x - c = 0

    (a/b x = c) b/a

    x = bc / a
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