Unit 2 - Test 2 - Logs and Exponentials - Support 2023

What kind of shift  is represented?

• up 1 unit
• left 1 unit
• right 1 unit 
• down 1 unit

Does the function represent a growth or decay function?

• Exponential GROWTH

• Exponential DECAY

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

• y = 15(35)^x

• y = 15(0.35)^x

• y = 35(1.15)^x

• y = 15(1.35)^x

There is a culture of bacteria that begins with 5000 cells and dies by 30% each year. Write an exponential model to represent the situation.

• y = 5000(0.70)^x

• y = 30(5000)^x

• y = 5000(1.30)^x

• y = 5000x^x

The population of mosquitoes at the beginning of the summer is 4000. The population grows at a rate of 25% a month. How many will there be after 4 months?

• 9766

• 9006

• 9760

• 5433

Is this exponential growth or decay?

• Growth

• Decay

• Linear

• Not a function

What is the y-intercept of the function?

• 2
• 3
• 1
• -2

Determine if the graph represents growth or decay. Also determine the y-intercept.

• decay, 5

• decay, 1

• growth, 5

• growth, 1

The value of a car you purchased for $20,000 decreases at a rate of 12% each year. What will the value of the car be after 3 years?

• $12,800.00

• $13,629.44

• $17,600.00

• $28,098.56

An initial investment of $480 earns interest for 7 years in an account that earns 13% interest, compounded quarterly. Find the amount of money in the account at the end of the 7 year period.

• $1138.34

• $1129.25

• $1175.34

• $695.340