exam Maths Puzzle Numerical Ability

What is the perpendicular distance between y=-3/4x-1 and 3x+4y=20 (problem #24)....x+3Y=6 and x+3y=-14 (problem #8).....and y=-3 and y=1???

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exam Other Question

Find and write out in rational form the term of (3x^2/2 - 1/3x)^12 that does not contain x. Find a polynomial of degree 4, having zeros 2, i, -2i, and 4.

I know you start out by getting (x-2)(x-i)(x+2i)(x-4), but I dont know where to go from there. Do I take two facto