Margins. They are what covers blank areas at the top, bottom, and sides of the page(:
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You can purchase a blank banner online from the Best Blanks website. Once on the page, you can choose the size and material of the banner you want to purchase.
The 'Y' axis.
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Since a penny blank won't fit into the machine when it's stamping dimes, it is virtually impossible to strike a dime on a penny blank. You would need to have your coin professionally examined and certified before you could even consider putting a value on it. Try checking out the ANACS Show page to see if they will be attending any coin shows in your area, where you can take your coin and have it examined for free : http://www.anacs.com/Default.aspx?Page=4
He did not invent the calculator- but was a professor of mathematics. See the link at the bottom of this page for information on him.