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

find the inverse of each function

m:x (2x-1)-3
_______
4
______________
5
Please help me on this problem. Many Thanks.


Theo has $5 more than Denise and Denise has $11 more than Rudy. Together they have $45. How much money does each have?