Elementary Algebra

$-16$
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 Perform multiplication first to obtain: $=4+(-2)-18$ Perform addition next, and then subtract to obtain: $=2-18 \\=-16$