1. On test day, a teacher sharpens 19 pencils to lend out to his students. If n represents the number of pencils that the teacher lends out, which expression represents the number of pencils he has left?
2. A cell phone company charges each customer a base rate of $15.00 per month for its services. The company also charges each customer $0.02 per minute used. Which algebraic expression represents each customer's monthly charge for m minutes?
3. Which expression represents 8 less than two times x?
4.
Irene has collected 28 stuffed animals, and she wants to donate some to the children's hospital. If x represents the number of stuffed animals she donates, which expression shows the number of stuffed animals Irene has left?
