Answer
$15$
Work Step by Step
Recall the acronym PEDMAS, which tells us the order of operations:
P: Parenthesis and other grouping symbols (We do everything in parenthesis first).
E: Exponents
D/M: Division and Multiplication (from left to right)
A/S: Addition and Subtraction (from left to right)
Evaluate by substituting the given value of the variable and then using order of operations to simplify:
$=2^4-(2-1)
\\=16-(1)
\\=15$
