Exponential Review

Is this exponential growth or decay?

• Growth
• Decay

What type of function is y = 7(5/4)^x?

• Exponential Growth
• Exponential Decay
• Linear
• None of the above

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

• y=5000(0.7)^x
• y=30(5000)^x
• y=5000(1.3)^x
• y=5000x^x

Is the pictured graph growth, decay, or linear or none?  

• Exponential Growth
• Exponential Decay
• Linear
• None

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

• $y=15\left(35\right)^t$

• $y=15\left(0.35\right)^t$

• $y=15\left(1.35\right)^t$

• $y=35\left(1.15\right)^t$

• $y=15\left(135\right)^t$

Which function represents the following situation:

Leah's hair was known to grow very rapidly. It began at a length of 6 inches and grew at a rate of 14% each week.

• $y=6\left(0.14\right)^x$

• $y=6\left(1.14\right)^x$

• $y=14\left(1.06\right)^x$

• $y=14\left(0.06\right)^x$

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

• Growth
• Decay

• Growth 
• Decay

Growth or Decay?

• Growth
• Decay