Question

Micah is writing a function that models the height a dolphin reaches when it propels itself from underwater to the surface, leaps through the air, and reenters the water. The model is represented by the equation h=-16t+96t-128, where h is the height in feet above the surface of the water and t is the time in seconds. According to Micha's model, how long will the dolphin be above the surface of the water?

Answer 1

as h is the height in feet above the surface of the water, set h to zero and solve the quadratic. that will give you time it leaves and time it re-enters water...