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Why are dimes and quarters ridged on the edges?
It's called "milling", and it's a historical relic. At one time, coins were made of precious metals (gold or silver). Unscrupulous people would shave the edges of coins and collect the shavings to melt down. Milling the edges makes it obvious that this has been done, and that the coin therefore wasn't worth full value. Neither quarters nor dimes still contain any gold or silver, but they're still milled, mostly because they've been that way for a long time, and ceasing to mill them would make them look "weird" to people at this point.
What is the shape of a can?
That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.
What is an area in math where numbers are represented by letters?
That is called "algebra".That is called "algebra".That is called "algebra".That is called "algebra".
A rule or problem containing two expressions and an equal sign between them are called?
That's called an equation.That's called an equation.That's called an equation.That's called an equation.
What is the number called from which you subtract?
It is called the minuend The number you subtract from it is called the subtrahend
