In American football, the ball is punted by dropping and kicking it before it hits the ground. The height h(t) of the football above the ground in meters t
seconds after being punted is affected by gravity and by the punter's kick,
and can be represented as the difference of two functions: a (t) = 4.2t?,
which specifies the effect of gravity on the height of the ball, and v (t) = 16.5t + 2, which specifies the effect of the punt on the ball.
With these two functions, h(t) = v(t) - a (t), how high above the ground was the ball when it was punted?