The total cost of buying 6 pencils can be written as the ratio 6 pencils : $3. Which model represents this ratio of pencils to dollars?

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.