### Home > A2C > Chapter 5 > Lesson 5.2.3 > Problem 5-93

Janelle conducted an experiment by mistake by leaving her bologna sandwich at school over winter break. When she got back, her sandwich was much larger than it was when she left it. Her science teacher explained that the sandwich had produced large quantities of a rare bacterium, bolognicus sandwichae. Based on a sample taken from the sandwich, Janelle determined that there were approximately

Use the equation .

What exponent should you use for

If you aren't sure, think about a simpler problem: what would you use for yesterday? The day before that? Notice that and

*would represent tomorrow and the day after that.*