Exponential Equations Review

• Growth

• Decay

Using the table below, find the equation that matches

• y = 20(2)^x

• y = 20(1/2)^x

• y = 2(20)^x

• y = 20(1.25)^x

How do you write 5% as a decimal?

• 50
• 5
• 0.5
• 0.05

• Growth

• Decay

• 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.

Simplify

• y²
• y³⁵
• y¹²
• y¹⁴

According to exponent rules, when we divide the same base, we _______ the exponents.

• add
• subtract
• multiply
• divide

Which ONE of the following equations represents exponential decay?