Answer:
<em>2740 </em>is your total; <em>p = 40n + 1900</em> is your equation.
Step-by-step explanation:
"p" represents total pay; "n" represents the number of copies he sells.
Base salary is 1900, and each copy sold gives him an extra 40
<em>p = 40n + 1900 </em>is your equation.
If he sells 21 copies. Plug in 21 for <em>n</em>
<em>p = 40n + 1900</em>
<em>p = 40(21) + 1900</em>
Simplify. Remember to follow PEMDAS. First, multiply, then add.
<em>p = 40(21) + 1900</em>
<em>p = 840 + 1900</em>
<em>p = 2740</em>
~