Evaluate the function to answer the question. The height h, in feet, of a ball that is released 6 ft above the ground with an initial upward velocity of 90 ft/s is a function of the time t, in seconds, the ball is in the air and is given by the following.

h(t) = 16t² + 90t + 6, 0 t 5.69

(a)Find the height of the ball (in feet) above the ground 2 s after it is released. ft

(b)Find the height of the ball (in feet) above the ground 4 s after it is released. ft