Math: Section 1

Question: 3 of 60

A phone company charges customers a monthly charge using the equation C = 40 + 0.3m, where Cis the monthly

charge, in dollars, and m is the number of minutes ed by the customer. If someone's monthly charge is $46, how

many minutes did the person use that month?

20 minutes

Step-by-step explanation:

The monthly charge (C) of the customer is represented by:

C = 40 + 0.3m

where m is the number of minutes used by the customer. We need to find how many minutes did the customer use if the bill is $46. For this we substitute 46 in place of C and find the corresponding value of m.

So,

46 = 40 + 0.3m

46 - 40 = 0.3m

6 = 0.3m

6/0.3 = m

m = 20 minutes

This means the person used 20 minutes which makes the bill equal to $ 46