Question 102587
In the grocery store where every number of the same item has a price.
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Example: If candy bars are 90 cents each the cost of x of them is 
Cost = 90x
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That is a function.
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The price of everything can be written as a function
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The time of sunrise can be written as a function of the day of the year.
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Your age is a function of the number of days since you were born.
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Cheers,
Stan H.