exam Maths Puzzle Numerical Ability

Is every monomial a term and every term a monomial? Support answer with reasons.

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exam Other Question

Please help me confirm I am doing this correctly:
4(2(-5x+y)-y)-10(y-4X) with the outside set of parenthesis being brackets Choose values of x, then simplify it correctly.
10x^2-30x+20/x^2-1
I did something wrong on that one, maybe someone could show me how it works.