Grade 8 Exponential Expressions & Equations Quiz

A population of bacteria doubles every 3 hours. If there are initially 500 bacteria, how many will there be after 9 hours?

• 8000

• 4000

• 2000

• 1000

A car's value decreases by 20% each year. If the car is currently worth $15,000, what will its value be after 2 years?

• $12,000

• $9,600

• $8,000

• $10,500

A bank offers an interest rate of 5% compounded annually. If you deposit $1,000, how much money will you have after 3 years?

• $1,050.00

• $1,200.00

• $1,100.00

• $1,157.63

A certain tree grows at a rate of 10% per year. If the tree is currently 4 feet tall, how tall will it be after 2 years?

• 5.00 feet

• 6.00 feet

• 4.20 feet

• 4.84 feet

A cell phone plan costs $50 per month and includes 2GB of data. Each additional GB costs $10. If you use 5GB in a month, how much will your total bill be?

• $90

• $70

• $100

• $80

The number of views on a video increases exponentially. If it starts with 200 views and triples every week, how many views will it have after 4 weeks?

• 8000

• 16200

• 24000

• 12000

A certain type of investment grows according to the formula A = P(1 + r)^t. If you invest $2,000 at an interest rate of 3% for 5 years, what will be the total amount?

• 3000.00

• 2318.55

• 2000.00

• 2500.00

A tree's height is modeled by the equation h = 3(2^t), where h is the height in feet and t is the number of years. What will the height be after 4 years?

• 32 feet

• 64 feet

• 48 feet

• 24 feet

A certain species of fish in a lake doubles its population every year. If there are currently 1,000 fish, how many will there be in 5 years?

• 32000

• 5000

• 64000

• 15000

A smartphone's battery lasts for 10 hours on a full charge. If it loses 15% of its charge every hour, how much battery will be left after 4 hours?

• 60%

• 50.625%

• 75%

• 45%