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?

Question

anonymous · Answer

I want to know long will the stay above the water?

anonymous · Answer

My apologies; misread

anonymous · Answer

Its completely okay. I just want to know how long will the dolphin stay above the water.

anonymous · Answer

|dw:1427834926305:dw|

h will be zero twice (surface of the water)

when you solve for t when h = 0, you will get two answers for t.

the difference between these numbers is the time spent above

anonymous · Answer

So, how long will the dolphin stay above the water?

anonymous · Answer

http://www.wolframalpha.com/input/?i=-16t^2%2B96t-128 this will give you your answer. the "roots" are the values of t when h = 0.

anonymous · Answer

It says that t=2 and t=4.