exam Maths Puzzle Numerical Ability

Find the equation that passes through these points: (100, 9440) and (400, 31040). (This is the equation for the Cost of a bookstore selling a certain textbook). Then, suppose th

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exam Other Question

A circle cuts the rectangular hyperbola xy=c^2 in four points.Prove that the product of the absiccae of the points is c^4 Evaluate if possible:

sgrt 4/25

I assume this can be evaluated because 4 can be divided by 2 and 25 can be divided 5 which leaves:
2/5 is this correct?