Solve the Problem
-April Shoots an Arrow Upward into the Air

Multiple Choice

Solve the problem
-April shoots an arrow upward into the air at a speed of 64 feet per second from a platform that is 21 feet high. The height of the arrow is given by the function $h ( t ) = - 16 t ^ { 2 } + 64 t + 21$ , where $t$ is the time is seconds. What is the maximum height of the arrow?

A) $85 \mathrm { ft }$
B) $21 \mathrm { ft }$
C) $17 \mathrm { ft }$
D) $64 \mathrm { ft }$