Final answer:
To find the number of minutes Ravi was billed for, we need to subtract the monthly fee from the total bill and then divide the remaining amount by the cost per minute.Ravi was billed for 91 minutes.
Step-by-step explanation:
To find the number of minutes Ravi was billed for, we need to subtract the monthly fee from the total bill and then divide the remaining amount by the cost per minute.
The equation for Ravi's bill is: $13.46 = $8 + $0.06x, where x is the number of minutes.
Subtracting $8 from both sides of the equation, we get $5.46 = $0.06x.
Dividing both sides by $0.06, we find that x = 91.
Therefore, Ravi was billed for 91 minutes.