Answer:
the person can make a maximum of 180 minutes of phone calls per month while spending no more than $40.
Explanation:
To determine the number of minutes of phone calls a person can make while spending no more than $40 per month, we need to set up an equation based on the given information.
Let's assume the number of minutes of phone calls made in a month is represented by "m."
The monthly cost of the phone plan is $18.40, and an additional charge of $0.12 is applied per minute of phone call usage. Therefore, the total monthly cost can be calculated as follows:
Total cost = Monthly plan cost + (Cost per minute × Number of minutes)
Total cost = $18.40 + ($0.12 × m)
We know that the person wants to spend no more than $40 every month, so we can set up the following inequality:
$18.40 + ($0.12 × m) ≤ $40
To solve for the number of minutes (m), we can rearrange the inequality:
$0.12 × m ≤ $40 - $18.40
$0.12 × m ≤ $21.60
Dividing both sides of the inequality by $0.12:
m ≤ $21.60 / $0.12
m ≤ 180
Therefore, the person can make a maximum of 180 minutes of phone calls per month while spending no more than $40.