exam Maths Puzzle Numerical Ability Profit and Loss

A triangle has sides 3x+7, 4x-9, and 5x+6. Find the polynomial that represents its perimeter.

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exam Other Question

What is the answer for mn to the 2nd power over pm to the 5th power n? I have to do a really big project and I got stuck doing this. I do not know what is means. What is an algebraic expression using equations and inequalities? Will you give me examples of each.