Real-Life Exponential Functions & Equations Quiz

A bacteria culture doubles in size every 3 hours. If the initial amount is 500 bacteria, how many will there be after 12 hours?

• 4000

• 8000

• 16000

• 2000

A car's value decreases by 20% each year. If the car is worth $15,000 now, what will its value be after 3 years?

• $10,000

• $7,680

• $12,000

• $5,000

A tree grows at a rate of 2 inches per year. If it starts at 5 inches, how tall will it be after 4 years?

• 13 inches

• 12 inches

• 15 inches

• 10 inches

A computer's processing speed is 2^3 GHz. If it is upgraded to 2^5 GHz, how many times faster is the new computer?

• 4

• 16

• 8

• 2

A population of fish in a lake is modeled by the function P(t) = 100(2^t), where t is the number of years. What will the population be after 5 years?

• 3200

• 4000

• 1600

• 800

If 3^x = 81, what is the value of x?

• 2

• 4

• 5

• 3

A savings account earns interest at a rate of 5% compounded annually. If you start with $1,000, how much will you have after 2 years?

• 1200.00

• 1050.00

• 1102.50

• 1150.00

A recipe calls for 2^3 cups of flour. If you want to make half the recipe, how many cups of flour do you need?

• 2 cups

• 8 cups

• 4 cups

• 1 cup

If 5^(x+1) = 125, what is the value of x?

• 4

• 2

• 1

• 3

A smartphone's battery lasts for 2^4 hours on a full charge. If you use it for 6 hours, how much battery life is left?

• 10 hours

• 14 hours

• 12 hours

• 8 hours