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2-18.
  1. Remember that one meaning of the word “evaluate” is to replace a variable with a number and to calculate the result. For example, when asked to evaluate the expression x2 when x = −2, the solution would be (−2)2 = 4.
    Evaluate the expressions below for the given values. Homework Help ✎

    1. −4d + 3 if d = −1

    2. km if k = 4 and m = −10

    3. t/w if t = 6 and w = −3

    4. x 2 + y 2 if x = 7 and y = 5

Substitute −1 for d.

−4(−1) + 3

Simplify the terms and combine them.

4 + 3 = 7

7

Follow the steps in part (a).

Put everything you substituted inside parenthesesso you do not lose your negative signs.

(4) − (−10)

Follow the steps in part (a).

−2

Follow the steps in part (a).