This problem is a checkpoint for writing exponential equations. It will be referred to as Checkpoint 9.

Write an exponential equation to represent the situation and answer the question.

1. If the cost of a loaf of bread is now $\$2.75$ and is increasing at $5\%$ per year, what will it cost $10$ years from now?

2. The population of Flood River City is now $42,000$. Experts predict the population will decrease $25\%$ each year for the next five years. What will be the population in five years?

3. A share of Orange stock that was worth $\$25$ in $2000$ was worth $\$60$ in $2010$. What is the multiplier and percent increase?

Check your answers by referring to the Checkpoint 9 materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 9 materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.