book Maths Puzzle Numerical Ability

A ball is thrown downward from a window in a tall building. Its position at time t in seconds is s=16t^2(32t), where s is in feet. How long (to the nearest 10th) will it take the b

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book Other Question

Find all the integral values for k for which the trinomial can be factored?
z^2+kx+12
r^2+kr+20
I can not for the life of me remember how to do this. I have tried numerous ways and still have not come to the correct answer.

2x to the 4-3x to the 3+x+1 is divided by 2x to the 2+x+1