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Mathematics 21 Online
OpenStudy (anonymous):

PLEASE HELP! what does f(x) mean in a problem like f(x)=68x+1000 there are 110million refrigerators in the US. THey use more than 20% of all household energy. Suppose a new refrigerator costs about $68 per year. The total cost of the refrigerator is a function of how long it used.

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