exam Maths Puzzle Numerical Ability

Please help.

Tim kicks a ball off the ground. After t seconds, its height, h (in feet), is given by the formula h = -16t^2 + 64t. What is the maximum height reached by the ball?

Thanks

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exam Other Question

I have to resolve this by graphing the equations in six different ways. Here they are to see if I am doing them right.
4x+3y=>24
3x+4y=>8
x=>0
y=>0

First I need to eliminat I am having problems with this problem

Find the length X in the triangle:
express in simplified radical form:
one side is 12
and the other side is 8

thank you alot I am not that good at these.