Please help! I don’t understand

What is the multiplicative rate of change of the exponential function shown on the graph?

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Which is f(5) for the function –2x2 + 2x - 3?