book Maths Puzzle Numerical Ability

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(1) 2x+y=5

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Hi I need a little help with this problem. The directions are to find the LCD and do not combine fractions.
13/x^2-16, 7/x-4
If you could show how you did the problem it would be a big help.. Thank you. 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