exam Maths Puzzle Numerical Ability

how would i do this? Simplify the following fractions by putting them in lowest terms or by performing the indicated operations.

xy-zy over y times xw-xy over yz yw

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exam Other Question

How would you factor out the greatest common factor for this problem?

13y^8+26y^4-39y^2

Help would be much appreciated.
what is 2y to the third minus 7y squared minus 15y factored?