The Height of a Projectile Fired Vertically into the Air $-$

Multiple Choice

The height of a projectile fired vertically into the air (neglecting air resistance) at an initial velocity of 144 feet per second is a function of the time and is given by the equation f ( x ) = 144 x $-$ 16 x 2 , where x represents the time. Find the highest point reached by the projectile.

A) 144 feet
B) 324 feet
C) 648 feet