CPM Homework Help : MC1 Problem 8-69

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8-69.

Evaluate the expressions below using $a = 3$ , $b = –4$ , and $c = 5$ .

$2a + c$
Step 1(a):
Replace each variable with its value.
$2\left(3\right) + 5$
Step 2(a):
Simplify the expression.
$2\left(3\right) + 5 =$
$6 + 5 = 11$
Answer (a):
$11$

$12-\left(a+b+c\right)$
Hint (b):
Follow the steps as outlined in part (a). Remember to work within the parentheses first.

$ab – 7$
Hint (c):
Again, you can substitute each variable for its value then simplify the expression.
Remember that $ab$
means $\left(a\right)\left(b\right)$ .
Answer (c):
$-19$

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