CPM Homework Help : CCA Problem A-18

Remember that one meaning of the word “evaluate” is to replace a variable with a number and to calculate the result. For example, evaluating the expression $x^2$ when $x=−2$ gives the solution $(−2)^2=4$ .

Evaluate the expressions below for the given values.

$−4d+3\text{ if }d=−1$
Step 1(a):
Substitute $−1$ for $d$ .
$−4(−1)+3$
Step 2(a):
Simplify the terms and combine them.
$4+3=7$
Answer (a):
$7$

$k − m \text{ if } k = 4 \text{ and } m = −10$
Hint (b):
Follow the steps in part (a).
More Help (b):
Put everything you substituted inside parentheses so you do not lose your negative signs.
$(4)−(−10)$

$\frac { t } { w }\text{ if } t = 6 \text{ and } w = −3$
Hint (c):
Follow the steps in part (a).
Answer (c):
$−2$

$x^2+y^2\text{ if }x=7\text{ and }y=5$
Hint (d):
Follow the steps in part (a).