exam Maths Puzzle Numerical Ability

parallelogram abcd is not a rectangle the points of a b c and d are (-2,2) (6,5) (4,0) (-4,-3) prove that paralleogram is not a rectangle

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This one is not working for me could I see a step by step please.

x^4+x^3-8x^2+x-6 / x^2+1 Three boys are going to a party and comparing how much money they have. sam works out that he has $6 more than Mark and $12 more than Dean. If they have $75 altogether, how much does Sam have?