exam Maths Puzzle Numerical Ability

(-6a3b4)^2

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Make f the subject from the following equation v=u+ft/m. If someone could help I would be grateful. thanks What is the image of x^2+y^2=1 under the mapping rule (x,y)> (3x+2,3y-5)? I got [1/3(x-2)]^2+[1/3(y+5)]^2=1 ?????