exam2reviewA

# exam2reviewA - Econ 1078.003 Spring 2008 Exam 2 Review...

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Econ 1078.003 Spring 2008 Exam 2 Review – Answers 1. Does = = + - = 6 3 3 0 1 2 3 3 i j j i ? Yes = - = + + + = 6 3 4 3 2 1 2 120 3 3 3 3 3 i i 120 3 3 3 3 3 3 0 4 3 2 1 1 = + + + = = + j j 2. Consider two statements: 8 : = + y x P 4 : = x Q and 4 = y Based on these statements, we would say that P is a (necessary/sufficient/both) condition for Q (circle one). P Q , So we would say that P is a necessary condition for Q. 3. Suppose I survey 200 people and find that 130 have been to Disneyland (D), 70 have been to Sea World (SW), and 16 have been to Six Flags (SF). I also know that 30 have been to Disneyland and Sea World, 8 have been to Disneyland and Six Flags, 6 have been to Sea World and Six Flags, and 3 people have been to all three. a. How many people have been to only Six Flags? b. How many people are in the set SW D SF \ ? (a) 5 people (b) 5 people 4. Consider the following function: 2 5 3 ) ( - + = x x x f a. Find the domain of f. b.

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exam2reviewA - Econ 1078.003 Spring 2008 Exam 2 Review...

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