### Home > CAAC > Chapter 2 > Lesson 2.1.2 > Problem 2-18

2-18.

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

*x*^{2}when*x*= −2, the solution would be (−2)^{2}= 4.

Evaluate the expressions below for the given values. Homework Help ✎−4

*d*+ 3 if*d*= −1*k*−*m*if*k*= 4 and*m*= −10if

*t*= 6 and*w*= −3*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).