exam Maths Puzzle Numerical Ability

y= -x^2

xy=1

y=-x^3

Please help me describe whether the given relations describe y as a function of x. Also what is the domain of each relation and/or function.

I have

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exam Other Question

I am not doing the formula correct, please help.

Given the following information, calculate the net present value:
Inital outlay is $50,000; required rate of return is 10%; cur
4xy5(4x5-5x4y2t2y3)