### Home > A2C > Chapter 12 > Lesson 12.5.2 > Problem 12-206

12-206.

Natural logs and exponential functions in base *e* are often used in formulas. For many problems you can use either the

You should get the same answer using natural logs.

See part (a).

Interpret the answer for part (a) if the equation represents an amount of money invested at

annual interest. What does

*x*represent in this equation?Interpret the answer to part (b) if the equation represents the price paid for a car that depreciates at

per year. What does

represent in this equation?