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Home > CCA > Chapter A > Lesson A.1.4 > Problem A-44

A-44.

Read the Math Notes box for this lesson. Then evaluate each equation below. Homework Help ✎

  1. For y = 2 + 3x when x = 4, what does y equal?

  • Rewrite the expression, substituting in the known variable.

    y = 2 + 3(4)
    y = 2 + 12

    y = 14

  1. For a = 4 – 5c when c = – , what does a equal?

  • See part (a) for a strategy to evaluate this expression.
    Remember to pay attention to negative signs.

  • a = 6.5

  1. For n = 3d 2 – 1 when d = –5 , what does n equal?

  • Rewrite the expression, substituting in the known variable.

  • n = 3(−5)2 − 1
    n = 3(25) − 1
    n = 75 − 1

  • n = 74

  1. For v = –4(r – 2) when r = – 1 , what does v equal?

  • Refer to parts (a) and (c).

  1. For 3 + k = t when t = 14, what does k equal?

  • Rewrite the problem, substituting in the known variable and then rearrange the problem to make it equal to the unknown variable.