CPM Homework Help : A2C Problem 2-18

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2-18.

Perform each operation in part (a) through (d) below.

$\frac { m } { 4 } + \frac { m } { 3 }$
Hint (a):
Remember to make a common denominator.
$\frac{3\textit{m}}{12}+\frac{4\textit{m}}{12}$
Answer (a):
$\frac{7\textit{m}}{12}$

$\frac { x } { 2 } - \frac { x - 1 } { 2 }$
Hint (b):
Remember to distribute the negative sign.
$\frac{8\textit{ mmy}}{\textit{xmx}}$

$( \frac { 8 m ^ { 2 } } { x } ) \cdot ( \frac { y } { m x } )$

Hint (c):

This is equivalent to:
$( \frac { 2 } { 3 } ) \div ( \frac { 5 } { 3 } )$

$( \frac { 2 } { 3 } ) \div ( \frac { 5 } { 3 } )$
Hint (d):
Remember division means multiply by the reciprocal of the divisor.
$\left(\frac{2}{3}\right)\cdot\left(\frac{3}{5}\right)$
Answer (d):
$\frac{2}{5}$

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