exam Maths Puzzle Numerical Ability

I really need help to solve the following

-k(-2-3) - (-2)(-k-5) = -2-(-2k+4) + 3 times the square root of -27

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exam Other Question

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. How do you convert a logarithm into a logarithm in base 8.