#### Answer

(a) $f(2)=15$
(b) $f(-1)=10$

#### Work Step by Step

(a) The value of $f(2)$ is the range element paired with the domain element $2$.
The domain element $2$ is paired with the range element $15$.
Thus, $f(2) = 15$.
(b) The value of $f(-1)$ is the range element paired with the domain element $-1$.
The domain element $-1$ is paired with the range element $10$.
Thus, $f(-1) = 10$.