If an object is dropped from a height of 85 feet, the function h(t)=-16t^2+85 gives the height of the object after t seconds. approximately, when will the object hit the ground?
a. 85.00 seconds
b. 69.00 seconds
c. 0.33 seconds
d. 2.30 seconds

We are given the function of the situation. The function is given as h(t) = -16t^2 + 85 where h(t) signifies that height is a function of time. For this case, our height would be zero and we find the time it hits the ground. Thus, 

0 = -16t^2 + 85
t = 2.30 seconds

The answer is d.