exam Maths Puzzle Numerical Ability

The surface area of a sphere varies directly with the square of its radius. If the surface area of a sphere with a radius of 12 inches if 576 square inches, find the surface area of a sphere with a radius of 3 inches

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exam Other Question

The longest side of a right trangle is 3 less than twice the shortest side. The third side measures 12 inches. Find the length of the shortest side. Use an associative law to find an expression equivalent to r+(s+48)