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Unformatted text preview: Name: ________________________ Class: ___________________ Date: __________ ID: A 1 Review for Chapter 8 Test Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. An initial population of 505 quail increases at an annual rate of 23%. Write an exponential function to model the quail population. a. f ( x ) = 505(0.23) x c. f ( x ) = 505(23) x b. f ( x ) = 505 0.23 g38 g39 x d. f ( x ) = 505(1.23) x ____ 2. The halflife of a certain radioactive material is 85 days. An initial amount of the material has a mass of 801 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 10 days. Round your answer to the nearest thousandth. a. y = 1 2 1 801 g228 g230 g229 g229 g229 g229 g229 g244 g246 g245 g245 g245 g245 g245 1 85 x ; 0.228 kg c. y = 801 1 2 g228 g230 g229 g229 g229 g229 g229 g244 g246 g245 g245 g245 g245 g245 1 85 x ; 738.273 kg b. y = 801 1 2 g228 g230 g229 g229 g229 g229 g229 g244 g246 g245 g245 g245 g245 g245 85 x ; 0 kg d. y = 2 1 801 g228 g230 g229 g229 g229 g229 g229 g244 g246 g245 g245 g245 g245 g245 1 85 x ; 0.911 kg ____ 3. Suppose you invest $1600 at an annual interest rate of 4.6% compounded continuously. How much will you have in the account after 4 years?have in the account after 4 years?...
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 Fall '09
 Johnson
 Algebra

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