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What is a calculating compass?
A tool invented by Galileo (who invented telescope) to help his math students solve problems. Go to google images for picture.
Sara is reading a math book The book is explaining how to subtract 3 from 5 Sara pictures 5 coins in her head and then takes 3 of the coins out of the picture?
Making mental images
Types of images in image processing?
Binary images, Indexed images, Grayscale images, True color images
How do you know if a coin is frosted proof or mirror proof?
A frosted proof coins were issued by the US Mint prior to 1936. In appearance they have a mirrorlike field [[the field of a coin is the flat areas not covered by the design]]with the design of the coin appearing to be frosted or dull in comparison to the field. This type of proof was again used on proof coins in the late 1970s and are refered to as "cameo" proofs. A mirror proof [[also called a Brilliant Proof]] has a mirrorlike surface over the entire coin. This type of proof was issued by the Mint from 1936 until sometime in the late 1970s.
What is a proof or uncirculated coin?
The term Proof actually refers to a method of manufacturing that produces coins with very sharp details and a mirrorlike surfaces and are called Proof coins. Uncirculated or Mint State coins are coins not released into circulation and have no wear on them.
