Answer:
<h2>17</h2>
Step-by-step explanation:
Use PEMDAS:
P Parentheses first
E Exponents (ie Powers and Square Roots, etc.)
MD Multiplication and Division (left-to-right)
AS Addition and Subtraction (left-to-right)
The answer is b.
Because you multiply (5•12)
-r
Step by step:
7r+(-8)
7r+(-8r)
-r