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1 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 1 of 8 Calculator Inactive Write your answers in the spaces provided. Present clear, concise solutions 1. Convert 3 x 2 8 into log form: (1M) 2. Convert 3log x 12 1 into exponential form: (1M) 2 3. Given the following equations, state whether the equation models exponential growth or exponential decay. Then from the equation, state what the growth rate or the decay rate is (2M) y x. y x. 4. Use the properties of logarithms to simplify or expand the following expressions (Do NOT evaluate the final expressions): (7M) log 5 4 3log 5 2 log 6 3x 3 y 2 (c) 3loga 2logb 5. Evaluate the following logarithmic equations: (10M) log 2 8 log log 2 64 log 2 2 (c) log 1 4 log log 1 100
2 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 2 of 8 6. Solve the following equations. Show a complete algebraic solution. (13M) x log x (c) x 2 (d) 2log 3 x 4
3 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 3 of 8 7. On the two grids provided below, first sketch a graph of y 2 x and then on the second graph, you will graph the transformed exponential graph y 4 2 x 3. For the transformed function, determine the domain, range, asymptote, x- and y-intercepts. (HINT: It may help to identify the transformations first) (7M) Domain: Range: x-intercept: QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. y-intercept: Asymptote: 8. Graph the function log 2 x 4 3. (HINT: Start with log 2 x ). State the domain, range, x- and y- intercepts, and the equation of the asymptote. (HINT: It may help to identify the transformations first) (7M) Domain: Range: x-intercept: y-intercept: QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Asymptote:
4 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 4 of 8 Calculator Active Write your answers in the spaces provided. Present clear, concise solutions 1. A $32,000 car decreases in value at an annual rate of 12%. (6M) Write an equation to model how the value of the car changes over time. What will be the value of the car in 5 years? Show a complete algebraic solution. (c) When will the value of the car be $12,000? Show a complete algebraic solution. 2. Mr. Santowski invests $20,000 into an account that earns interest at a rate of 10%/a, compounded monthly. (6M) Write an equation to model how the value of the investment changes over time. What will be the investment in 4 years? Show a complete algebraic solution. (c) When will the value of the investment be $40,000? Show a complete algebraic solution.
5 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 5 of 8 3. The radioactive isotope carbon-14 is used to determine the approximate date of artifacts found at archaelogical sites. Carbon-14 has a half-life of 5370 years. If a sample of pottery found at a site has 23% carbon-14 remaining, determine the age of the pottery. Show a complete algebraic solution. (4M) 4. Mr Santowski invests some money in an investment that is compounded continuously at an interest rate of 7%. You long will it take to triple my investment? (4M)
6 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 6 of 8 5. The population of California was 33,000,000 in the year 2000 and has been growing at an annual rate of 1.3%. The population of Texas was 20 million in the year 2000 and has been growing at an annual rate of 2.1%. Will the population of Texas ever exceed that of California? If so, when? Explain your reasoning (either algebraic, graphic, numeric or elsewise) (4M) 6. The population of Cornwall (Mr. Santowski s home town) was 46,000 ten years ago (in 1998), but has changed to a current population of 40,769. Determine an equation in the form of y ab x that models the population of Cornwall. Let x = 0 represent the year Show necessary algebraic work. (5M)
7 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 7 of 8 7. Solve the following exponential and logarithmic equations. Show complete algebraic solutions to earn full credit for your work. (13M) 4 x 2 27 log 2 4x 5 (c) log 2 x 1 log 2 x 1 3 (Verify solution) (d) 3ln x ln2 4
8 11/3/09 Chapter 8 Exponential & Logarithmic Functions Page 8 of 8 8. You are given that log , log , log Use this given information and the properties of the logarithms to evaluate the following expressions: (6M) log log 7 80 (c) log Solve the equation e 0.3x e 1 ln 4x 1 2 for x graphically. Explain what you are looking for and what equation(s) you used. State your window settings. Include a rough sketch the graph (no points necessary, just give me a general idea of the graph) QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture.
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