exam Maths Puzzle Numerical Ability

Hi May I have help with this problem?

Draw the parallelogram with verticies A(8, 5), B(17, 5), C(12, 10), and D(21, 10) on a coordinate plane. Find the area of the rectangle

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Could someone help me with figuring out this math problem, thanks a lot. f(x)=2x^3-3x+1. find f(3). Floor plans for a building have the four corners of a room located at the points (2,3), (11,6), (-3,18), and (8,21). Determine whether the side through the points (2,3) and (11,6) is perpendicular to the side through the points (2,3) and (-3,18).