You throw a ball straight up from a rooftop 30 feet high with an initial speed of 48 feet per second. The function s(t)= 16t^2 + 48t + 30 models the ball’s height above the ground, s(t), in feet, t seconds after it was thrown.

During which time period will the halls height exceed the rooftop?

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?