$\"\"$

\

The cost of one magazine is 3.99 dollars.

\

Write the expression for 5 magazines total cost is $\"\"$ .

\

Rewrite 3.99 as $\"\"$ .

\

$\"\"$

\

Apply distributive property: $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ . $\"\"$

\

The total cost is 19.95 dollars.