A professional stunt performer at a theme park dives off a tower 21 m high into the water. His height above the ground at time t seconds is given by the equation h= -4.9t^2 + 21. a) How long does it take to reach the halfway mark?
b) How long does it take to reach the water?
c) Compare the times in (a) and (b). Explain why the time at the bottom is not twice the time at the halfway point.

the dimensions are:

step-by-step explanation:

we want to find the dimensions of a rectangular box with volume of

we factor to obtain;

we rewrite the rightmost factor to obtain;

recall that:

we apply difference of two squares formula to obtain;

hence the dimensions are

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.