CPM Homework Help : CCAA Problem 2-19

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 $x=−2$ results in the solution $(−2)^2=4$ .

Evaluate the expressions below for the given values.

$−4d+3$ 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):
$7$

$k−m$ if $k=4$ 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 track of your negative signs.
$(4)−(−10)$

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

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