exam Maths Puzzle Numerical Ability

The height h in feet of an object after t seconds is given by the function h=-16t^2+60t+4.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

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exam Other Question

5^(x+7)=625^(x-7)
x= ?
The price of an item is given by p=2x^2-200. Find the polynomial that represents the revenue generated from the sale of x items.