exam Maths Puzzle Numerical Ability

Hi, Can anyone help with this word problem? The height h in feet of an object after t seconds is given by the function h = -16t2 + 20t + 5. 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

How would you solve this equation?

2x(3x-5)=0
A transformer has 20 primary windings and 100 secondary windings. If the secondary voltage is 25 v, find the primary voltage