My Spouse Was Recently in Mexico, and I Had to Determine

Essay

My spouse was recently in Mexico, and I had to determine the cheapest way to call. AT&T has an international wireless plan called World Connect with a monthly fee of $3.99, and then my calls to a Mexican landline are $0.09 per minute. Without this plan, I would pay no monthly fee and $0.49 per minute.
a. Write equations for the cost C of each option.
I'm using the letter _______________ to represent the variable quantity __________.
b. Solve the system of equations you wrote in part a to find the number of minutes for which the two options would cost the same. (Round to the nearest whole minute.)When would it make sense to pay for the World Connect plan?