exam Maths Puzzle Numerical Ability

Please help.

5s^2+5s/35s^2+25s

Thanks.

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exam Other Question

x-2 = x+2/4 + 5

I know that x is 10, but I need to know how to figure that out. Which of the following are functions?Explain your reasoning.

f(x)=5 if x>0
f(x)=-5 if x<0
f(x)=5 or -5 if x=0