The Path of Flight (Trajectory) of a Football Thrown by a Quarterback

Multiple Choice

The path of flight (trajectory) of a football thrown by a quarterback is described by the following function: where y = vertical position of football relative to the ground (m) x = horizontal position of football relative to launch position (m)
How high above the ground is the football when it is 30 meters downfield from the quarterback?

A) 1.1 m
B) 2.2 m
C) 28 m
D) 7.9 m