CPM Homework Help : CC3 Problem 8-92

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8-92.

For each equation below, solve for $x$ . Sometimes the easiest strategy is to use mental math.

$x - \frac { 3 } { 5 } = 1 \frac { 2 } { 5 }$
Hint (a):
$x-\frac{3}{5} = \frac{7}{5}$
Can you use mental math to solve this equation?

$5.2 + x = 10.95$
Answer (b):
$x = 5.75$

$2x − 3.25 = 7.15$
Answer (c):
$x = 5.2$
Be sure to know how to get this answer using mental math. Recognize that $3.25 + 7.15$ equals an even decimal, $10.4$ .

$\frac { x } { 16 } = \frac { 3 } { 8 }$
Hint (d):
$8\left(2\right) = 16$
What must $x$ be?

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