Selim is ordering concrete spheres to place as barriers in the city park. The spheres cost $2 per square foot, and Selim can spend $20 per sphere. What is the maximum diameter of the spheres he can purchase?
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Answer:1.78 feet.Step-by-step explanation:If they cost $20 each and its $2 per square foot, the area of the spheresis 20 / 2 = 10 ft^2.Area of sphere = 4 π r^2 = 10 (where r = the radius)—> r^2 = 10 / 4π= 0.796—> r = 0.892 ftSo the diameter = 2 * r= 1.78 feet to nearest hundredth.