8) Gianna is going to throw a ball from the top floor of her school. When she throws the ball from 96 feet above the ground, the function h(t) = –16t2 + 160 +96 models the height, h, of
the ball above the ground as a function of time, t. (part b on the next page)
a) When will the ball hit the ground? Write your answer in complete sentence and make sure
to write the units. (5 points)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling