exam Maths Puzzle Numerical Ability

Exercises on radicals. What is the fifth root of 147? How to simplify or solve this expression? Thanks very much!

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exam Other Question

Suppose the sets A and B are bases for a subspace W in R^n. Prove that neither set can contain more elements than the other.

Here is what I have figured out so far and I need h
simplify:

square root of 7/100