book Maths Puzzle Numerical Ability

I really need help please I do not get this problem at all:

The time t in hours, that a storm will last is given by the formula t= square root of d cubed over 216, where d is t

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book Other Question

I am not sure how to do this problem because I have no number for a.
8-3x^2=-13
I plugged in my a,b,c for the quadratic formula,but my a was 0. I am not sure how to do this now! a football player runs directly down the field for 35 m before turning to the right at an angle of 25 degree from his original direction and running an additional 15 m before getti