Each student at a community college pays a student services fee of $20.
a. Complete Table 5 to help find an expression that describes the total cost (in dollars) of tuition plus the services fee if a student pays t dollars for tuition. Show the arithmetic to help you see a pattern.

b. Evaluate the expression you found in part (a) for t = 417. What does your result mean in this situation?

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Table 5 Tuition and Total Cost Total Cost (dollars) Tuition (dollars) 400 401 402 403