CPM Homework Help : INT1 Problem A-86

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A-86.

Simplify each expression.

$\frac { 5 } { 4 } \div \frac { 7 } { 16 }$
Hint (a):
When you divide a fraction, you are also multiplying by its reciprocal.
More Help (a):
$\frac{5}{4}\cdot\frac{16}{7}$
Answer (a):
$\frac{20}{7}\ =2\frac{6}{7}$

$- \frac { 10 } { 13 } \cdot \frac { 5 } { 11 }$
Hint (b):
Multiply the numerators and the denominators. Be sure to account for the negative sign.

$\frac { 9 } { 11 } \div ( - \frac { 20 } { 21 } )$
Hint (c):
See part (a).
More Help (c):
$\frac{9}{11}\cdot\left(-\frac{21}{20}\right)$

$- \frac { 8 } { 3 } \div ( - \frac { 5 } { 18 } )$
Hint (d):
See part (a).
Answer (d):
$\frac{144}{15}$
Remember to reduce the fraction and convert to a mixed number.

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