exam Maths Puzzle Numerical Ability

What is the center and radius of the circle with equation x^2+y^2+2x-3y-4=0

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exam Other Question

The profit earned from manufacturing x widgets is .0001x3 - .21x2 + 135x - 2000 dollars. Other contraints dictate that at least 200 widegets but no more than 950 widgets be manufac divide 3x4+2 by x+1 (the x is to the fourth power) and check