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

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(16946) (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
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