A cellular phone company offers several different service options. One option, for people who plan on using the phone only in emergencies, costs the user $4.50/month plus $0.59/min for each minute the phone is used. Write a linear function for the monthly cost y of the phone in terms of the number of minutes x the phone is used.?       Use the function to find the cost of using the cellular phone for 18 min in 1 month.

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Q: Suppose that the weight (in pounds) of an airplane is a linear function of the amount of fuel (in…

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.