Exponential Growth and Decay Problems

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Questions and Answers

Find a bank account balance if the account starts with $100, has an annual rate of 4%, and the money is left in the account for 12 years.

160.10

How much caffeine will you have left in your system after drinking a beverage with 120 mg of caffeine, where the caffeine decreases by about 13% each hour for 4 hours?

68.74

How many players remain after 5 rounds if the tournament starts with 128 participants and half of the players are eliminated during each round?

4

How many cell phone subscribers were there in 1994 if there were 285 subscribers in 1985 and the number increases by 75% per year?

<p>43872</p> Signup and view all the answers

How much of the original air is present after 240 breaths if during normal breathing about 12% of the air in the lungs is replaced after each breath and the initial amount of air is 500 mL?

<p>2.37e-11</p> Signup and view all the answers

Simplify: $24x^6y^{-3} / (12x^{-8} y^7)$

<p>2x^14 y^4</p> Signup and view all the answers

Simplify: $-(9xy)^0$

<p>-1</p> Signup and view all the answers

Simplify: $5x^2y (2x^4 y^{-3})$

<p>10x^6 / y^2</p> Signup and view all the answers

How long would it take to double your principal at an annual interest rate of 7% compounded continuously?

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If you invest $2000 at an annual interest of 5.5% compounded continuously, how much will you have in the account in 10 years?

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What is the value of a painting in 25 years if the original value is $1400 and it increases by 9% each year?

<p>$12,072.31</p> Signup and view all the answers

What is the value of a sculpture in 2006 if its value in 2000 was $1200 and it is increasing at a rate of 8% per year?

<p>$1904.25</p> Signup and view all the answers

How many people will remain in the population of a town in 2008 if the population is decreasing at a rate of 1% per year from 1300 people in 2000?

<p>1200 people</p> Signup and view all the answers

What is the fish population after 7 years if it originally was 48,000 and is decreasing at a rate of 3% per year?

<p>38,783 fish</p> Signup and view all the answers

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Study Notes

Bank Account Growth

  • Starting balance of $100 with a 4% annual interest rate over 12 years results in a balance of $160.10.

Caffeine Decay

  • Consuming 120 mg of caffeine decreases by 13% each hour; after 4 hours, approximately 68.74 mg remains in the system.

Tennis Tournament Elimination

  • A tournament begins with 128 participants; after 5 rounds of halving, only 4 players remain.

Cell Phone Subscribers

  • In 1985, there were 285 cell phone subscribers, growing at 75% annually; by 1994, subscribers increased to 43,872.

Lung Air Replacement

  • Initial lung capacity of 500 mL, with a 12% air replacement each breath leads to approximately 2.37e-11 mL remaining after 240 breaths.

Algebraic Simplification

  • Simplifying ( \frac{24x^6y^{-3}}{12x^{-8}y^7} ) results in ( 2x^{14}y^{4} ).
  • Simplifying ( -(9xy)^0 ) results in -1.
  • Simplifying ( 5x^2y(2x^4y^{-3}) ) results in ( \frac{10x^6}{y^2} ).

Continuous Compound Interest

  • Time to double principal with a 7% annual rate compounded continuously is part of a hypothetical question without a specific answer provided.

Investment Growth

  • Investing $2000 at a 5.5% annual interest rate compounded continuously:
    • After 10 years, exact future value not calculated.
    • Duration needed to grow to $5000 is explored without a specific answer.

Artwork Value Increase

  • A painting valued at $1400 increasing by 9% annually will be worth approximately $12,072.31 in 25 years.

Sculpture Valuation

  • A sculpture valued at $1200 in 2000, increasing at 8% per year, will reach a value of approximately $1,904.25 in 2006.

Population Decay

  • A town with a population of 1300 in 2000 decreasing at a rate of 1% annually will have about 1200 residents by 2008.

Fish Population Decline

  • An original fish population of 48,000 decreasing at 3% per year results in an estimated population of 38,783 after 7 years.

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