Solve the Problem $t$ Seconds Is $h = - 15 t ^ { 2 } + 540 t$

Multiple Choice

Solve the problem.
-A projectile is thrown upward so that its distance above the ground after $t$ seconds is $h = - 15 t ^ { 2 } + 540 t$ . What is its maximum height?

A) $7290 \mathrm { ft }$
B) $4860 \mathrm { ft }$
C) $2430 \mathrm { ft }$
D) $3645 \mathrm { ft }$