Being an NFL Player
What it takes to be in the NFL
What do NFL Players use?
When you reach the NFL you would have to use Linear Functions because they will get paid quite a lot of money. In their career they will make money but some will be fined and lose money. They don't get fined a tremendous amount but they will lose some money.
Also in the NFL they could use Scatter Plots to compare your height and your weight or other stats. Some of the Nike sponsored players could have wrist bands that can measure their pulse rate and monitor it. Stats of a game could be calculated and then be posted for career accomplished.