exam Maths Puzzle Numerical Ability

Determine whether -4th root of 16 is rational or irrational.

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exam Other Question

w + 4/8 = w + 10/5 40. The cost in millions of dollars for a company to manufacture x thousand automobiles is given by the function C(x) = 4x2-40x+225. Find the number of automobiles that must be produced to minimize cost.