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A cell phone carrier charges a monthly fee of $20 and also charges customers $0.05 per text message. The function C(t)+0.05t+20 represents the cost of C, per month based on t text messages in a month.
Which best describes the domain of the function?
All real numbers
All real numbers that are multiples of 0.05
All whole numbers
All whole numbers for 0 to 20
Sagot :
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