exam Maths Puzzle Numerical Ability

what does it means by: dtermine wheather each graph represents Y as a function of X

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exam Other Question

is it the same as irratinal roots?where you have to simplyify [u must have a perfect square?]like 4 example: /72 A total of $8000 is invested , part at 3% and the rest at 4% per year. If the annual return on theses investments is $275, how much is invested at each rate?