## Elementary Algebra

$27$
The order of operations follow the PEMDAS rule. First Priority: P -Parentheses Second Priority: E - exponents Third Priority: M/D - Multiplication or division, whichever comes first from the left Fourth Priority: A/S - Addition or subtraction, whichever comes first from the left Apply the exponent to obtain: $=7-4 \cdot 5 \div (-1)$ Perform multiplication next to obtain: $=7-20 \div (-1)$ Divide to obtain: $=7 -(-20)$ Subtract to obtain: $=7 + 20 \\=27$