SOLUTION: Hello, once again I'm not understanding this question. Please help A professional stunt performer at a theme park dives off a tower, which is 21m high, into water below. The p

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Question 305740: Hello, once again I'm not understanding this question. Please help
A professional stunt performer at a theme park dives off a tower, which is 21m high, into water below. The performer's height, "h", in meters, above the water at "t" seconds after starting the jump is given by h=-4.9t^2+21.
a)How long does the performer take to reach the halfway point?
b)How long does the performer take to reach the water?
Thank you
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a) what is the halfway point? plug that in for h solve for t.
b) what height is the water? plug that in for h and solve for t