### Home > GB8I > Chapter 2 Unit 2 > Lesson INT1: 2.2.2 > Problem2-60

2-60.

If, for a certain function, $f(a)=51$, calculate the following values.

1. $f(a)−8$

Since $f(a)=51$, substitute $51$ in for $f(a)$ and evaluate the expression.

1. $\frac{1}{2}f(a)$

$25.5$

1. $\frac{1}{2}f(a)−8$

Substitute and evaluate.