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How do you write a function rule that describes a cost of a CD that is $2 each?

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Nov 26, 2014

If the number of CDs is #x#, the total cost of the CDs can be described by the function:

#f(x)=2x#

As an example, if one wants to buy 6 CDs, the total cost they will have to pay will be given by:

#f(6)=2(6)#
#f(6)=12#

That is, they will have to pay $12.

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