Functions and Change A Modeling Approach to College Algebra
Section 1- 1 Functions Given by Formulas
For functions that model practical phenomena, the variables involved often have units associated with them.
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The only valid way of presenting a function is with a formula.
represents the value of a car t years after it is purchased from the dealer, then
indicates the value of the car on the showroom floor.
represents the cost of purchasing b burgers, f orders of fries, and d drinks, then
represents 10 burgers, 6 orders of fries, and 12 drinks.
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