exam Maths Puzzle Numerical Ability

A transformer has 20 primary windings and 100 secondary windings. If the secondary voltage is 25 v, find the primary voltage

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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. I need help with answering this problem. Thanks!

Factor Completely: a(to the power of 4) -(minus) b(to the power of 4)