Answer:
46 minutes.
Step-by-step explanation:
You have a gift certificate worth $20 for one long-distance phone call.
The charge for the first minute = $1.10
Let the other additional minutes that you can talk = x
The charges for the x minutes = 0.42 per minute
the equation will be : 1.10 + 0.42x = 20
0.42x = 20 - 1.10
0.42x = 18.90
x = [tex]\frac{18.90}{0.42}[/tex]
x = 45
1 minute for $1.10 + 45 minutes for $0.42/min.
you can talk for 46 minutes.
