Sandra buys 70 pencils with fuzzy tops. She gives 4 to each of her 15 classmates. The expression for the number of pencils she has left is 70 – (4 • 15) .

Answer each question to identify the parts of the expression.

1. In this expression, what does 70 represent?

You coordinate volunteers for litter cleanup in local parks. your spreadsheet lists drivers and the number of seat belts in each driver’s car. the spreadsheet calculates the number of drivers (d) and the total number of seat belts (s). you want to know the maximum number of volunteers, besides drivers, that can be transported to the park in a single trip given that each person must have a seat belt of their own.