exam Maths Puzzle Numerical Ability

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find an equation of the circle with center (7, -2) and radius square root of 5

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exam Other Question

a number increased by twice the square root is 48. what is this number The cost in millions of dollars for a company to manufacture x thousand automobiles is given by the function C(x)=4x^2-16x+32. Find the number of automobiles that must be produced