book Maths Puzzle Numerical Ability

solve for m: a+2mn=c

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book Other Question

Please help me with this problem using the pythagrean theorum. One leg of a right triangle is 8 inches long. The hypotenuse is 2 inches longer than the other leg. What is the length of the hypotenuse. I am not sure if I am doing this question right or not. Reduce the fraction.

-20t^5 u^2 v^3
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48t^7 u^4 v

I think the answer is

-5v^2
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12t^2 u^2

Am I right?