the telephone company offers two billing plans for local calls. Plan 1 charges $29 per month with unlimited calls and Plan 2 charges $11 per month plus $0.04 per call

Answer 1

If the question asks how many calls must be made to make the unlimited plan worth the cost, then set them equal, solve for x.

29 = 11 + .04c where c is the number of calls.

18 = .04c

18/.04 = c = 450 calls.

The plans cost the same at 450 calls. The flat rate plan is the better value if more than 450 calls are made.