Mastering Growth and Decay: Fun with Equations

A population of rabbits doubles every year. If there are currently 50 rabbits, how many will there be in 3 years?

• 800

• 200

• 400

• 100

A tree grows at a rate of 2 feet per year. If it is currently 10 feet tall, how tall will it be in 5 years?

• 20 feet

• 30 feet

• 15 feet

• 25 feet

A bacteria culture decreases by 25% every hour. If there are 200 bacteria at the start, how many will remain after 3 hours?

• 84

• 150

• 100

• 50

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

• $14,450

• $18,000

• $12,000

• $16,000

A savings account earns 5% interest compounded annually. If you deposit $1,000, how much will you have in the account after 3 years?

• 1100.50

• 1050.75

• 1157.63

• 1200.00

A plant grows 3 inches every month. If it is currently 12 inches tall, how tall will it be in 6 months?

• 30 inches

• 36 inches

• 24 inches

• 15 inches

A radioactive substance decays by 10% every day. If you start with 500 grams, how much will remain after 4 days?

• 250 grams

• 328.05 grams

• 400 grams

• 450 grams

A population of fish in a lake decreases by 30% each year due to overfishing. If there are 1,000 fish now, how many will be left after 2 years?

• 490

• 600

• 800

• 700

A tree's height increases by 4 inches each year. If it is currently 15 inches tall, what will its height be in 4 years?

• 20 inches

• 35 inches

• 25 inches

• 31 inches

A certain type of mold grows by 50% every day. If you start with 10 grams, how much will you have after 3 days?

• 50 grams

• 20 grams

• 33.75 grams

• 15 grams