If $3^{x}=5$, the value of $3^{x+2}$ is
(A) 10
(B) 25
(C) 2187
(D) 14
(E) 45

Part B: Each correct answer is worth 6.
Using exponent laws, $3^{x+2}=3^{x} \cdot 3^{2}=3^{x} \cdot 9$.

Since $3^{x}=5$, then $3^{x+2}=3^{x} \cdot 9=5 \cdot 9=45$.

ANSWER: (E)