exam Maths Puzzle Numerical Ability

If 3x+y=90 and 10<=x<=25 what is the least possible value of y?

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exam Other Question

The length of the conjugate axis is 8 units and the vertices are at ( -3,9) and ( -3, -5 ) Evaluate, if possible
3√-8/27
This is suppose to be a radical sign √ but this is as close as I could get.