exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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 Determine if the following are solutions to the inequality...
-1, 1, 6, 13

x - 3>_6 (the _ is supposed to be inderneath the >)

Can someone please help me, I do not understand how to do these at all.