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

$1$
Recall the acronym PEDMAS, which tells us the order of operations: P: Parenthesis and other grouping symbols (including fraction bars) 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: $=\dfrac{16 + 9}{4-(-21)} \\=\dfrac{25}{4+21} \\=\dfrac{25}{25} \\=1$