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1. Consider the rule
= the amount of credit (in dollars) that Citibank Visa will allow a 20 year old with a
yearly income of m dollars.
a. What is the input variable and its units?
b. What is the output variable and its units?
c. Write the meaning of C(45,000) = 12,000 in a sentence.
2. A toy store must pay $12.60 each for a popular computer game. The store’s monthly fixed cost associated with
this game is $750. The store can sell one of these games for $16.
a. What is the cost function?
b. What is the revenue function?
c. What is the breakeven point?
3. You invest $5000 for 6 years. Find the value of the investment for each interest rate.
a. 4% compounded annually b. 4% compounded quarterly c. 4% compounded continuously
4. The following table shows the total enrollment in Math 19 at Minnesota College over a 5 year period:
Year
2000
2001
2002
2003
2004
Number of Students
420
432
446
460
475
a. The college wants the class size for Math 19 to be 42 students. How many sections of the course will they need
in 2006?
b. When (in what year) will there be 625 students in the course?
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 Fall '07
 Karstens
 Math, Calculus

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