This worksheet can be used in several different ways. The first way is it is a great homework assignment because the best-fit equations are given. This is good for students that don't have a graphing calculator. Do the worksheet like this allows the students to practice finding values given different information.
The second way you can use this worksheet is by deleting the formulas and have the students find the formulas using the calculators, then have answer the questions.
Either way, this is a great way to practice this important skill.