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:
15 minutes
Step-by-step explanation:
Here the given function that shows the cost( in dollars ) of phone call after taking m minutes,
[tex]C=0.50+0.10(m-1)-----(1)[/tex]
If the bill is $ 1.90,
That is, C = 1.90
From equation (1),
[tex]1.90=0.50+0.10(m-1)[/tex]
[tex]1.90-0.50=0.10(m-1)[/tex] ( Subtracting 0.50 on both sides ),
[tex]1.40=0.10(m-1)[/tex]
[tex]14=m-1[/tex] ( Dividing both sides by 0.10 ),
[tex]15=m[/tex] ( Adding 1 on both sides ),
Hence, 15 minutes were taken for talking.
