exam Maths Puzzle Numerical Ability

A ball is thrown upward into the air with an initial velocity of 128ft/s. The equation h(t)= -16t2 + 128t. Find the maximum height that the ball will attain?

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My equation is:

-t
- > -15
2

This is one of the most confusing equations 4 me.

If anyone could help me with this,I will be very thankful

Kia,14
Perform the indicated operation and simplify.

square root of 18x TIMES square root of 2x cubed


square root of 5(3 square root of 5 -4)