book Maths Puzzle Numerical Ability

What is surface area?

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These things are hard for me, can you please help?

simplify

cubed rt 9x^2y * cubed rt 3x^3y^2

Is the answer 3xy cubed rt 3x^2?

Thanks
The diameter of a round dinner plate is 10 inches. What is the area of the plate?
a)314 square inches
b)39.25 square inches
c)78.5 square inches
d)39.25 square inches