Answer using set notation if possible.
What is the domain?

What is the range?

Is this the graph of a function? Justify with evidence from the graph.

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.