exam Maths Puzzle Numerical Ability

What is the square root of 7 (2 the square root of 3 + 3 the square root of 7)?

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exam Other Question

How would you solve (x+y)cubed? Solve the following problem:

What is the expression raised to the fourth power is 81x^12y^8z^16?

I have tried to figured this problem out and cannot seem to figure out how to solve. I need some help with this one, thanks.