exam Maths Puzzle Numerical Ability

I need to find the second moment of area of a rectangular beam, can anyone please help?!

The equation: I = bd^3/12 (second moment of area of a rectangular beam) becomes => b(2b

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exam Other Question

The rectangle ABCD is inscribed in the circle with center (0,0) and radius 6. The x-coordinate of the vertex A is expressed as x. Then express the area S of the rectangle ABCD as Evaluate

-c2nd power - 5(c 0 power + d)2nd power if c = -3 and d = 4