Exponential Equation Word Problems

Luke invested $250 in an account that earns 3.5% annual interest compounded continuously. No other money is deposited or withdrawn, How long will it take for the account to earn $100 interest?

• 3.8 yr

• 9.6 yr

• 7.1 yr

• 5.9 yr

Tags

CCSS.HSF.LE.A.4

Anakin invested $300 in an account with interest compounded continuously. No other money was deposited or withdrawn. In 12 years the amount in the account was $500. What was the annual interest rate?

• 4.25%

• 3.15%

• 5.0%

• 2.8%

Leia bought a car for $9000. It depreciates at 11% per year. How long will it take for the car to be worth $4000?

• 2 yr

• 11 yr

• 5 yr

• 7 yr

Tags

CCSS.HSF.LE.A.4

An element with a half-life of 44 days has a mass of 20 grams 80 days. What was the original mass?

• 83.1 g

• 70.5 g

• 38.9 g

• 57.2 g

Tags

CCSS.HSF.LE.A.4

The population of a certain city grew from 480,000 to 600,000 in 11 years. What was the rate of increase?

• 5.25%

• 1.55%

• 4.65%

• 2.05%

Tags

CCSS.HSF-LE.A.1C