exam Maths Puzzle Numerical Ability

Prove that the diagonals of a square bisect each other. (Do not use congruent triangles)

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exam Other Question

2 raised to the -4 power 1.Given the total cost function: TC = 100 + 40Q - 15Q^2 + 5Q3, calculate the average fixed cost function (AFC) (Points: 5)
AFC = 100/Q
AFC = 40 -15Q + 5Q^2