exam Maths Puzzle Numerical Ability

A 31-inch square TV is on sale at the local electronics store. If 31 inches is the measure of the diagonal of the screen, use the Pythagorean theorem to find the length of the side

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I have a few questions like these in my college algebra book with no examples to help.

10-13/x=4+5/x

and

x/(x+4) + 4/(x+4) + 2= 0 .75x+.40y=25.00
x+y=45