Dr. Alban bought shirts for the new members of her chorus. The cost for ordering x number of shirts, including a one-time shipping fee of $3.99, was $77.49. Each shirt cost $12.25. Which equation could be used to find x?

Each month, a phone company charges $20 for 500 minutes of talk time plus $0.45 for each additional minute. unlimited texting costs $30 more. choose an expression to show the cost of a talk-and-texting plan for one month, given x minutes over 500.