exam Maths Puzzle Numerical Ability

The perimeter of a square is 20 centimeters. Find the length of a diagonal.

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exam Other Question

I hate math,and I need to write a 7 page paper on how it feels to go threw a math process, Can I get everybodys input. Simplify by adding like terms

-3xy + 8xy^-1x^0/y^-2 - 3x^2x^-1x/(x^-1)^-1