Tablet Service Sprint offers a monthly tablet plan for $34.99. It includes 3 gigabytes of...

Tablet Service Sprint offers a monthly tablet plan for $34.99. It includes 3 gigabytes of data and charges $15 per gigabyte for additional gigabytes. The following function is used to compute the monthly cost for a subscriber.

Compute the monthly cost for each of the following gigabytes of use.

(a) 2

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(b) 5

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(c) 13