Question

Call Wireless phone company charges $0.50 for the first call you make and $0.10 for each additional minute. The cost of a phone call can be expressed by the formula C = 0.50 + 0.10(m – 1), where C is the total cost in dollars and m is the number of minutes that you talk. If the bill for your phone call was $1.90, how long did you talk?.

Answer 1

15 minutes

Explanation:

Here the given function that shows the cost( in dollars ) of phone call after taking m minutes,

`C=0.50+0.10(m-1)-----(1)`

If the bill is $ 1.90,

That is, C = 1.90

From equation (1),

`1.90=0.50+0.10(m-1)`

`1.90-0.50=0.10(m-1)` ( Subtracting 0.50 on both sides ),

`1.40=0.10(m-1)`

`14=m-1` ( Dividing both sides by 0.10 ),

`15=m` ( Adding 1 on both sides ),

Hence, 15 minutes were taken for talking.

Answer 2

If the bill for your phone call was $1.90, we talked for 15 minutes. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.