exam Maths Puzzle Numerical Ability

Simplify

5x 4power - 2n 2nd power - (-x fourth power - x 2nd power)

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exam Other Question

Subtract

8 7/10 - 6 11/15
Simplify:

(5*x^2*y)^2*3*x*y^2
hope I wrote that right. It looks like this:
(5x^2y)^2*3xy^2
Thanks so much for all your help.