A chain−saw rental firm charges $20 per day or fraction of a day to rent a saw, plus a fix...

A chain−saw rental firm charges $20 per day or fraction of a day to rent a saw, plus a fixed fee of $7 for resharpening the blade. Let S (x) represent the cost of renting a saw for x days. Find each of the following.

(a)

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(b) S(1)

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(c)

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(d)

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(e) What does it cost to rent for  days?

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(f) A portion of the graph of y = S(x) is shown on the following page. Explain how the graph could be continued.

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(g) What is the domain variable?

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(h) What is the range variable?

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(i) Write a sentence or two explaining what (c) and its answer represent.

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(j) We have left x = 0 out of the graph. Discuss why it should or should not be included. If it were included, how would you define S (0)?