Exponential Functions

An investment of $8,200 loses value at a rate of 2% per year. To the nearest cent, what will be the value of the investment after 9 years?

• $8,531.28

• $6,836.73

• $3.28

• $7875.30

The population of a town is decreasing at a rate of 1% per year. In 2000 there were 1300 people. What will the population be in 2008?

• 0

• 332,800

• 1,408

• 1,200

The number of student athletes at a local high school is 300 and increasing at a rate of 8% per year. How man student athletes will there be after 5 years?

• 441

• 197

• 440

• 198

• 23% increase

• 23% decrease

• 77% increase

• 77% decrease

• 81,000

• 27,000

• 9,000

• 3,000

An economist predicts that the number of employees with a certain company will increase by 50% each year. There are 600 employees now. According to the economist’s prediction, how many employees will be with the company exactly 3 years from now?

• 2,025

• 38

• 64,800

• 24,000

• 99.5%

• 0.995%

• 0.05%

• 0.5%

Treatment for feline hyperthyroidism involves a single dose of radioactive iodine. The amount of radioactive iodine remaining following treatment is shown in the table. About how much radioactivity will still remain 20 days after treatment?

• 0.38

• 1

• 0.53

• 0

Sam deposited $200 into a savings account that pays 4% interest compounded monthly. Approximately how long will it take for the deposit to be worth $225?

• 1 month

• 2 months

• 3 months

• 4 months