Homework Help: Math 157

Posted by Lori on Sunday, March 28, 2010 at 10:08pm.

A 7 inch pizza cost $8 and a 14 inch pizza costs $20. Tommy says the smaller pizza is a better buy because the larger pizza is twice as big and more than twice as expensive. Do you agree with his reasoning? Explain why or why not.

Math 157 - Ms. Sue, Sunday, March 28, 2010 at 10:16pm
Area of 7 inch pizza:

A = pi * r^2
A = 3.14 * 3.5 * 3.5
A = 38.465 square inches

8/38.465 = $0.21 per square inch

Follow the above procedure to find the area and cost per square inch of the larger pizza.
Math 157 - Lori, Sunday, March 28, 2010 at 10:23pm
A = pi x r^2
A = 3.14 x 7 x7
A = 153.86
20/153.86 = $0.13 per square inch
Math 157 - Ms. Sue, Sunday, March 28, 2010 at 10:29pm
Right! :-)
Math 157 - Lori, Sunday, March 28, 2010 at 10:44pm
Thank you!
Math 157 - Ms. Sue, Sunday, March 28, 2010 at 10:48pm
You're welcome.

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