exam Maths Puzzle Numerical Ability

3r+1<4r+7

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please solve this quadratic formula for me, this is an algebra book question.

6x^ +3x -18 =0, help me please 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