exam Maths Puzzle Numerical Ability

Simplify by combining like terms

sqrt of 63 - 2 sqrt of 28 + 5 sqrt of 7

Thank you - Hope this makes sense

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exam Other Question

Find all of the zeros of the polynomial function and state the multiplicity of each.
f (x) = (x^2� 9)^2 can anyone help me solve this: find the balance(to the nearest cent) if $24,000 is invested at an annual interest rate of 6.8% for 10 years compounded continuously. I have tried to solve 5 times but cannot come up with a reasonable answer.