Question

Evaluate e-1/2f when e=15 and f=2

Answer 1

When you evaluate an expression you take the number for each letter and plug it into the problem. 
15 - 1/2(2)   Now use order of operations to simplify 
15- 1 
14

Answer 2

Your answer should be 15 { 15-1/2(2) = 14 }