exam Maths Puzzle Numerical Ability

Please help me factor the polynomial. Thanks

49r^2+81s^2

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exam Other Question

Hi I need someones help, I am supposed to evaluate ^-3sqrt of 64 if possible. I tried to do just that, but I keep coming up with the problem itself. I am not getting anything diffe "Find the length of the legs of a right triangle having a perimeter of 56m if the hypotenuse is 25m." Thanks for the help!