exam Maths Puzzle Numerical Ability

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x^2+x+sqrt[x^2+x]-2=0

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exam Other Question

The length of a rectangle is 1 cm more than 5 times its width. If the area of the rectangle is 79 cm2, find the dimensions of the rectangle to the nearest thousandth.

I get so confused on these questions. I am just lost on this. Please help!!! Simplify: 12/x+h+15 - 12/x+15 all divided by h