AlgebraEasyMeaning of the constant in a cost function
Algebra practice question
The monthly cost C, in dollars, of a phone plan with m minutes of calls is given by C(m) = 25 + 0.5m. What does the number 25 represent?
- A. The monthly charge when no minutes are usedCorrect
- B. The cost of each minute of calls
- C. The number of minutes included each month
- D. The total cost for 50 minutes
Answer: A. The monthly charge when no minutes are used
At m = 0, C = 25: the fixed monthly charge.
Why the other answers are wrong
- B. The cost of each minute of calls
- Each minute costs $0.50.
- C. The number of minutes included each month
- No minutes are included; every minute is charged.
- D. The total cost for 50 minutes
- 50 minutes would cost 25 + 25 = 50.
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