Logarithms 1



Continuous vs Non-Continuous Exponential Equations.doc

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Exponential growth or decay can be modeled using either the Continuous or Non-Continuous form of the Exponential equation.

Examples:

a) A population of 300 is increasing at a continuous rate of 5%: [pic]

c) A population of 300 is decreasing at a continuous rate of 5%: [pic]

b) A population of 300 is increasing at a rate of 5%. (non-continuous)[pic]

d) A population of 300 is decreasing at a rate of 5%. (non-continuous)[pic]

Questions:

Write an exponential equation for each situation described. (For the problems below use the non-continuous form unless continuous growth or decay is explicitly stated.)

1) A bank account is started with a $1,000 deposit and the interest rate is 3% compounded continuously.

2) A bank account is started with a $1,000 deposit and the interest rate is 3% compounded annually.

3) The population of bacteria is 5000 and is decreasing continuously at a rate of 1.2%.

4) The population of bacteria is 5000 and is decreasing at a rate of each hour 1.2%.

5) A sample of an isotope has a half-life of 50 years. Write an equation for the quantity, Q, left after t years, if the initial amount is Q0.

6) The population of birds in an area is 2,000 and is increasing at a rate of 8% every 2 years.

7) The population of bees is 50,000 and is decreasing at continuous rate of 4.5% per year.

8) A car was purchased for $25,000 and depreciates by 18% each year.

9) You invest $5,000 in a bank CD with 1.8% interest compounded daily.

10) The value ‘V’ of an investment is doubling every 10 years.

Write an equation for the value after t years, if the initial amount is V0.

11) The thickness of a piece of paper doubles after each fold. Write an equation for the thickness after x folds, if the initial thickness is 0.005 inches.

12) The population of ants in world is 50,000,000,000,000,000 and is increasing continuously at a rate of 0.5%.

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Continuous Exponential Equation

[pic]

Exponential Equation

[pic]

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