exam Maths Puzzle Numerical Ability

I have a parallelogram with 4x in the bottom left corner, 2x in the bottom right corner, and 60 in the top right corner. I need to find the value of each variable in the parallelog

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exam Other Question
What is the derivative of 8x^3/2-12x^-1/2?
Answer is 8/15(5x-2)^3/2. Not sure how they got the answer. Please help. Write an equation for the line that has the same slope as 2x-4y=13 and contains the point (6,8)