Question

An Internet service provider charges $50 a month. The user gets 10 GB of free Internet usage. Once the usage goes over 10 GB, the company charges the user $4 per GB. This rate continues until the usage reaches 25 GB, beyond which the company charges the user $3 per GB. Which graph shows the monthly bill for a user whose usage is x GB?

Answer 1

Answer is in attachment.

Answer 2

Answer:

See figure attached.

Step-by-step explanation:

Let's define:

x: internet usage, in GB

y: cost,  in $

Between 0 GB and 10 GB, the cost is always $50.

Between 10 GB and 25 GB, cost is a line with slope = $4 per GB which pass through point (10, 50), the last point of the previous segment.

From 25 GB on, cost is a line with slope = $3 per GB which pass through point (25, 110), the last point of the previous segment.