book Maths Puzzle Numerical Ability

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

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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 PLEASE HELP ASAP!!!
I have posted this problem and haven't received an answer. Can anyone help me with this.

cubedroot3(sqrt81x^4y^8

A)9x^2y^4
B)3xy^2 (sqrt3xy^2)
C)9xy^2