exam Maths Puzzle Numerical Ability

Please help me factor completely. Thanks!

49r^2+81s^2

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exam Other Question

Divide
x^2+2x-15/4x^2 divided by x^2-25/2x-10

Thanks John Roberts has $42,180.53 in a brokerage account, and he plans to contribute an additional $5,000 to the account at the end of every year. The brokerage account has an expected a