A company wants to have $20,000 at the end of a ten-year period by investing a single sum now. How much needs to be invested in order to have the desired sum in ten years, if the money can be invested at 12%? (Ignore income taxes.) Refer to exhibit 12B-1 and Exhibit 12B-2

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.