At Joe's Pizza a 16 inch diameter pizza and a 12-inch-diameter pizza cost the same per square inch of top surface area. If the cost of a large pizza is 8.00, what is the cost, in dollars, of the smaller pizza?
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At Joe's Pizza a 16 inch diameter pizza and a 12-inch-diameter pizza cost the same per square inch of top surface area. If the cost of a large pizza is 8.00, what is the cost, in dollars, of the smaller pizza?
A12 x
––––– = –––––
A16 8.00
36 π x
––––– = –––––
64 π 8.00
9 x
––––– = ––––– —> crossmultiply —> 16 • x = 8.00 • 9
16 8.00 16x = 72.00
x = 4.50 cost of 12 inch pizza
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