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The Professor, Taught at USC Years Ago
Category: Homework
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Experience:  Engineering Degree, Tutoring Experience, USC Faculty (Retired)
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# Need help with an algebra question for my son.

### Customer Question

Need help with an algebra question for my son. :Nails are given names such as 2 penney,3 penny and so on.What is the name of a nail that is 2 1/2 inches long.(equation-: nail lenth=1+1/4(x-2).....x-penny nail.      I know the answer is eight but I cannot explain to my son how to get the steps right.
Submitted: 9 years ago.
Category: Homework
Expert:  The Professor replied 9 years ago.
Here is a table of the "penny" sizes for nails, with a little speculation about how the name came to be.

http://www.southernpine.com/expert/index.pl?leafcode=19

But HERE is some text that explains how to compute the actual "penny" size - disregard the video and just consult the text:

http://www.bobvila.com/HowTo_Library/Nail_Sizes--T322.html

Take the length of the nail, subtract half an inch, and multiply by four.

If you consult the table in the first link above, you will see that this formula works.

Let D be the "penny" size, and L be the actual length of the nail in inches. Then:

D = ( L - .5 ) * 4

Customer: replied 9 years ago.
I was looking more of a reply to solve the equation but this reply will be sufficient. Thank you
Expert:  The Professor replied 9 years ago.

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