Exponential Review

Which of the following functions represents an initial amount of $15 and an increase of 35% each year?

• Growth

• Decay

In 1960 the country of Puerto had a population of 337,000 people Its population is decreasing exponential at a rate of 5%. According to this model what would the population of Puerto be in 2020? Round to the nearest whole number.

• 15,526 people

• 338 people

• 3 people

• 2,923 people

• 43,309 people

What is the growth or decay rate for the following equation?
y = 1/3(0.7)^x

• 7% decay
• 70% decay
• 30% growth
• 30% decay

How do you write 5% as a decimal?

• 50
• 5
• 0.5
• 0.05

A collectible car has been going up in price by 10% each year. If the car is already worth $29,000, how much will the car be worth in 5 years?

• $0.29
• $2,900,000,000
• $46,704.79
• $145,000

• The initial value of the car is 18,500

• The value of the car decreases by a factor of .85 each year

• The value of the car increase by a factor of .85 each year.

• The final value of the car after t years.

• The population of Mathville is increasing by a factor of 1.12 each year.

• The initial population of Mathville is 1.12 million.

• The population of Mathville is decreasing by a factor of 1.12 each year.

• None of the statements are true.

A culture initially contains 60 bacteria. The number of bacteria doubles each hour. Write the formula for the number, N , of bacteria after  hours.

• 5

• .89

• 19.9

• 35.56