exam Maths Puzzle Numerical Ability

I am lost on these problems and need help

simplify by combining like terms
x square root 18 - 3 square root 8x^2


simplify each radical expression

(square root3 + 5)(squ

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exam Other Question

How do I calculate the square root of 14,641 and how do I calculate the 6th root of 46,656,000,000. These are part of my summer assignment. Here is an interesting problem
Solve the problem:
P(x)=-0.002x²+1.2x-300

Thanks