exam Maths Puzzle Numerical Ability

Can somebody help me?

x+s/xs^2 + 6x+3/x^2s

Thanks.

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exam Other Question

I need help writing a binomial expansion for this expression...

(m+n^2)^4

Thank you in advance to anyone that can help me. c.

is this correct

simplify: √80 minus √5

my answer: 3√5