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

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.

Answer 2

Answer:

15 minutes

Step-by-step 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.