john is deciding between two different movie streaming sites to subscribe to. plan a
costs $20 per month plus $1 per movie watched. plan b costs $10 per month plus $3
per movie watched. let a(x) represent the monthly cost of plan a if john watches 2
per month, and let b(x) represent the monthly cost of plan b if john watches :
movies per month. graph each function and determine which plan would be cheaper
if john plans on watching 4 movies each month.