Step 1: Using one-step equations to solve problems. A) Suppose you send about 12 text messages a day, and your older sister sends more text messages than you do. Together, you send a total of about 26 messages a day. About how many text messages does she send a day? Write an equation and solve for the unknown value.

B) Your father uses text messaging to communicate with his employees. If he sends an average of 19 text messages each day, how many more text messages does he send than you? Write an equation and solve for the unknown value.

C) Your parents allow you to have internet access on your cell phone as long as you prepay the bill. If your bill is $17.50 per week, how much would you have to save per day to pay the bill? Describe the step-by-step process you use to solve the problem.