exam Maths Puzzle Numerical Ability

Let f(x)=1-2x and find

a) f^-1 (x) and b) 1/f(x)

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exam Other Question

could you help me: determine the correct half-plane and complete a graph for y>3 Please someone help. There is simply no way to multiply this. i came up with, 27xy + 64yx +9y. What am i doing wrong?
(3x + 3y)2(2x + 3y)