exam Maths Puzzle Numerical Ability

Could someone help me with figuring out this math problem, thanks a lot. f(x)=2x^3-3x+1. find f(3).

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The sum of two integers is thirty. Eight times the smaller integer is six more than five times the larger integer. Find the integers. 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