## Intermediate Algebra for College Students (7th Edition)

$9$
Recall the acronym PEDMAS, which tells us the order of operations: P: Parenthesis and other grouping symbols E: Exponents D/M: Division and Multiplication (from left to right) A/S: Addition and Subtraction (from left to right) Use the rule above to obtain: $=-11 - [-20]$ (Recall, $a-(-b)=a+b$). $\\=-11 + 20 \\=9$