Quiz 6.1/6.2 Exponential Growth and Decay

A population of 1500 deer decreases by 1.5% per year. At the end of 10 years, there will be approximately 1290 deer in the population.

Which function can be used to determine the number of deer, y, in this population at the end of t years?

• $y=1500(1-0.015)^t$

• $y=1500(0.015)^t$

• $y=1500(1+0.015)^t$

• $y=1500(1.5)^t$

There were 417 cell phones sold at an electronics store in January. Since then, cell phone sales at this store have increased at a rate of 3.75% per month.

At this rate of growth, which function can be used to determine the monthly cell phone sales x months after January?

• $f(x)=417(1-0.0375)^x$

• $f(x)=417(1-3.75)^x$

• $f(x)=417(1+0.0375)^x$

• $f(x)=417(1+3.75)^x$

Some banks charge a fee for a savings account that is left inactive for an extended period of time. 

The equation  $y=5000(0.98)^x$   represents the amount remaining, y, of one account that was left inactive for a period of x years. 

What does the number 5000 represent in this situation?

• A fee charged for an inactive account

• The percent of money in the account after x years

• The amount of money in the account initially

• The amount of money in the account after x years

A population of fish starts at 8,000 and increases by 6% per year.

What is the fish population in 10 years?

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CCSS.HSF-LE.A.1C

Daniel’s Print Shop purchased a new printer for $35,000. Each year it depreciates at a rate of 5%.

How much will the printer be worth in 8 years?

• $23,219.72

• $136.72

• $51,710.94

• $16,710.94

Classify the model as Exponential GROWTH or DECAY.

 $A=1200(.85)^6$  

• Growth  $y=a\left(1+r\right)^t$  

• Decay  $y=a\left(1-r\right)^t$  

Classify the model as Exponential GROWTH or DECAY.

 $A=10(1.01)^3$  

• Growth  $y=a\left(1+r\right)^t$  

• Decay  $y=a\left(1-r\right)^t$  

Emily would like to buy some new furniture for her home. She decides to buy the furniture on credit with 9.5% interest compounded quarterly. If she spent $7,400, how much total will she have paid after 8 years.

• $15,415.94
• $15,683.28
• $15,927.56
• $16,109.05

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Jasmine puts $4000 into an a savings account which offers 8% interest and compounds interests continuously for 3 years. Which expression could be typed into the calculator to see how much money Jasmine will have after 3 years?

• 4000(1+.08)³

• 4000e^(.08)(3)

• 4000(1+3)^.08

• 4000(1+.08/3)³⁽³⁾

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Courtney saved up $2,200 working as a waitress over the summer. She put this money into a bank account that earned 5.2% interest and is compounded daily. How much will she have in her account at the end of 4 years?

• $2201.25

• $2694.55

• $2707.45

• $2708.63

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