Real-World Population Growth & Decay Challenges for 8th Grade

A town's population is 10,000 and is growing at a rate of 5% per year. What will the population be in 3 years?

• 12000

• 11000

• 11576

• 10500

A city has a population of 50,000 that is decreasing by 2% each year. What will the population be after 4 years?

• 45000

• 48000

• 50000

• 46118

A wildlife reserve has 200 deer, and the population is increasing by 10% annually. How many deer will there be in 5 years?

• 250

• 322

• 280

• 400

A bacteria culture starts with 1,000 bacteria and doubles every hour. How many bacteria will there be after 6 hours?

• 128000

• 50000

• 64000

• 32000

A town's population graph shows a steady increase from 15,000 to 20,000 over 5 years. What is the average annual growth rate?

• 6.67%

• 10%

• 5%

• 8%

A city experiences a population decline from 80,000 to 60,000 over 10 years. What is the average annual decay rate?

• 2000

• 3000

• 1500

• 2500

A fish population in a lake is currently 5,000 and is expected to decrease by 15% each year due to overfishing. How many fish will be left after 2 years?

• 4500

• 5000

• 3000

• 3612

A new housing development is expected to increase the population of a small town from 12,000 to 15,000 in 2 years. What is the percentage increase in population?

• 25%

• 15%

• 30%

• 20%

A graph shows the population of a city over 10 years, starting at 30,000 and ending at 25,000. What does this indicate about the population trend?

• The population trend is fluctuating.

• The population trend is increasing.

• The population trend is stable.

• The population trend is declining.

A research study shows that a certain species of bird has a population of 1,200 and is declining at a rate of 8% per year. How many birds will be left after 3 years?

• 934

• 1,100

• 800

• 1,000