# SOLUTION: The cost of a pizza varies directly with the square of its radius. If the cost of the pizza is \$8.00 when the radius is 8 inches, find the cost when the radius increases to 10 inch

Algebra ->  Algebra  -> Proportions -> SOLUTION: The cost of a pizza varies directly with the square of its radius. If the cost of the pizza is \$8.00 when the radius is 8 inches, find the cost when the radius increases to 10 inch      Log On

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 Click here to see ALL problems on Proportions Question 385272: The cost of a pizza varies directly with the square of its radius. If the cost of the pizza is \$8.00 when the radius is 8 inches, find the cost when the radius increases to 10 inches.Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!The cost of a pizza varies directly with the square of its radius. If the cost of the pizza is \$8.00 when the radius is 8 inches, find the cost when the radius increases to 10 inches. ... Cost c proportional to r^2 ... where k is the constant of proportionality r=8 c =8 plug these values divide both sides by 8^2 ... k=8/8^2 k=1/8 ... k=1/8 r=10 c=kr^2 c=1/8*10^2 c=100/8 c=\$ 12.50 ... m.ananth@hotmail.ca