CPM Homework Help : INT1 Problem A-9

The word “evaluate” has many different meanings. In math, when you are asked to evaluate an expression for a specified value of the variable(s), you are being asked to determine the value of the expression. You do this by replacing a variable with the given number and calculating the result.

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(b):
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:
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:
Follow the steps in part (a).