exam Maths Puzzle Numerical Ability

Find the constant term of the expansion of (x-2/x^3)^12.

I know that the constant term is independent of an x-value. I'm really confused as to how the k term is determined in or

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exam Other Question

What is the image of x^2+y^2=1 under the mapping rule (x,y)--(3x+2,3y-5)? I think the answer is 1/3(x-2)^2+1/3(y+5)^2=1 . Can someone PLEASE help me? How do I find the coordinates of the vertices of each figure after the given transformation is performed, and How do I graph the premiage and its image?

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