Write an equation that represents the following problem.
there are two cell phone plans available from cell phones r us company. plan a charges $30 a month plus $0.01 for every text message. plan b charges $20 a month plus $0.05 for every text message. how many text messages do you need to send in order for plan a to cost the same as plan b?
30 + 5m = 20 + m
30 + 0.05m = 20 + 0.01m
20 + 0.05m = 30 + 0.01m
20 + 5m = 30 + m