Here we want to analyze the given graph.
The answers are:
a) for 500 messages the cost is $30 and for 1800 messages the cost is $80.
b) It means that for 1400 messages the cost is $60.
c) Because there is a fixed cost for the first 800 messages.
<em>Let's expand more on each solution.</em>
First, remember that the horizontal axis represents the number of text messages end in hundreds, while the vertical axis represents the cost in dollars.
a) We want to find the cost for 500 texts and 1800 texts.
To find the cost for 500 texts, you need to <u>count 5 squares on the horizontal axis</u>, and then see where the graph intersects the vertical axis for that value.
We can see that:
f(500) = $30
We do the same for 1800 (this time you count 18 squares), then we get:
f(1800) = $80
b) f(1400) = 60
This would mean that <u>the </u><u>cost </u><u>of 1400 text messages is</u><u> 60 dollars.</u>
c) Assume that for the first 800 text messages you have a fixed cost, and after that the company starts to charge an extra for each message you send, this is why we would have a linear increase after the message number 800.
If you want to learn more, you can read:
brainly.com/question/11252591
