Mrs. ripley baked a pie for lunch, which she cut into 8 pieces. mrs. ripley and her friends ate 6 pieces of the pie, what percentage of the pie remained

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.