141Bquiz2c - 1 MATH 141B Quiz#2 Version A Due: Tues Jan 29,...

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Unformatted text preview: 1 MATH 141B Quiz#2 Version A Due: Tues Jan 29, 2008 Print Name: Instructor: Dr. Fabbri [ 2 ] 1. By analyzing the matrix dimensions, which of the following statements are true? i) Suppose that A is a (5 2)-matrix and C is a (4 3)-matrix. If B is an ( m n )-matrix such that the product A ( BC ) is a (5 3)-matrix, then m = 2 and n = 4 . ii) If A and B are (4 3)-matrices then ( A + B ) 2 is also a (4 3)-matrix. iii) If A is a (1 3)-matrix and B is a (3 1)-matrix then AB is a real number. A) i) and ii) only, B) i) and iii) only, C) ii) and iii) only, D) i) only, E) all true [ 2 ] 2. Consider the matrices A = 1 0 2 0 1 2 2- 1 ,B = 1- 2 1- 1 2 3 2 and C = - 1 0 0 2 0 0 3 . Which of the following statements are true? i) AC = CA . ii) The ( AB ) 12 =- 2 iii) ( A 3 ) 31 =- 10 A) i) only, B) i) and ii) only, C) i) and iii) only, D) ii) and iii) only, E) none true [ 2 ] 3. Consider a population of birds partitioned into two age categories: hatchlings,...
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141Bquiz2c - 1 MATH 141B Quiz#2 Version A Due: Tues Jan 29,...

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