exam Maths Puzzle Numerical Ability

Find the center and radius of the circle: x^2 + y^2 - 6x + 8y + 21 = 0

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exam Other Question

an orchard operator must dilute 11 quarts of 60% insecticide solution by adding water. How many quarts of water should be added to get a mixture that is 2% insecticide? 5.5cg=____dg