exam Maths Puzzle Numerical Ability

4xy5(4x5-5x4y2t2y3)

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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 using the geometric sequence of numbers 1,1/2,1/4,1/8... to find the following..What is r, the ratio between 2 consecutive terms? show work

using the formula for the sum of the