Question

a person walking across a bridge accidentally drops an orange into the river below from a height of 40ft. The function h=-16t^2+40 gives the orange's approximate height h above the water, in feet, after t seconds. Graph the function. In how many seconds will the orange hit the water?

Answer 1

the orange will hit the water when h=0. so solve the eqution:

0 = -16t^2 + 40

Answer 2

I dont understand you, do the equation and give me the answer

Answer 3

"do the equation and give me the answer" ???!!!! what's the magic word.