Simplify the following fraction to lowest terms.
$-\frac{28}{49}$

Determine if the following pair of fractions is equivalent by simplifying.

$\frac{3}{5}$ & $\frac{12}{20}$

Determine if the following pair of fractions is equivalent using cross products.

$\frac{-6}{21}$ & $\frac{2}{7}$

Determine if the following pair of fractions is equivalent.

$\frac{9}{4}$ & $\frac{27}{12}$

Simplify the following fraction to lowest terms.

$\frac{16}{24}$

Simplify the following fraction to lowest terms.

$\frac{3}{7}$

Simplify the following fractions to lowest terms.

$\frac{30y}{80}$

Simplify the following fractions to lowest terms.

$\frac{15x}{35}$

Simplify the following fractions to lowest terms.

$-\frac{42mn}{60n}$