exam Maths Puzzle Numerical Ability

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Rationalize the denominator
3 sqrt3y^4 over 3 sqrt15x^4

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exam Other Question

Arrange in order from smallest to largest.
2.05, 25/10, 2.0513, 2.059, 251/100, 2.0515, 2.052, 2.051

Can someone please help me. Once again I do not even no where to start. (the 25/20 and 251/100 are fractions.) Hi there, was wondering if someone could explain this for me?
Explain the meaning of "factor of a polynomial" and explain the meaning "to factor a polynomial"
thanks