exam Maths Puzzle Numerical Ability

How do you solve this:

m2 + n2/m2-n2 + m/n-m + n/m+n

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exam Other Question

Peter received commissions of $150 and $225. How much be receive from a third sale so his total commission will exceed $500? I need help in finding the x-intercept and the y-intercept of this function

f(x)=3/x2-4