The monthly cost C for a cell phone is $20 each month plus $.10 for each minutes used. Which equation can be used to find the total cost (in dollars) for a month when m minutes are used?
A. C= m+20
B. C= 0.1m+20
C. C= 10m+20
D. C=20m
The correct equation that can be used to find the total cost (in dollars) for a month when m minutes are used is:
B. C = 0.1m + 20
To find the total cost for a month when m minutes are used, we need to consider the monthly cost of $20 plus the cost per minute.
The cost per minute is given as $0.10, and we need to multiply this by the number of minutes used, m.
Therefore, the equation that represents the total cost C in dollars for a month when m minutes are used is:
C = 0.10m + 20
Hence, the correct answer is B. C = 0.10m + 20.