Answer:
a = 5 seconds and b = 50 inches c = No, because it starts at 50 inches and only goes down after that. This means it will never be at 120 inches.
Explanation:
A. Solve it as a quadratic equation where h = 0 (because it will be 0 inches above the water).
0 = - 16t^2 + 70t + 50
0= -2(8t^2 - 35t -25)
0= -2(t - 5)(8t + 5)
Since the amount of time has to be positive, t - 5 = 0, so t = 5 seconds
B. Substitute t = 0 into the equation.
h = -16(0)^2 + 70(0) + 50
h = 0 + 0 + 50
h = 50 inches
C. It's diving, so it's only going down and won't reach 10 feet.