Jesse D. answered • 12/10/19

Patient and Experienced Mathematics and Spanish Tutor

Hi there! Great questions :)

For this cell phone plan, we know we have to pay a flat fee of $3. After that for every text message we send, we will be charged $0.08. Let's say "m" is the number of text messages sent and "C" is the total monthly cost of the plan:

C = .08m + 3

Now, it says she sends and receives 1800 texts per month. This is the number we will plug in for "m":

C = .08(1800) + 3

C = $144

This is a pretty high price for a cell service! In real world terms, she would be better to find a cell phone plan that doesn't charge per text since she sends such a high volume of text messages.