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Unformatted text preview: Math 201  Test 3 Section: ID# or Group: Name: Show appropriate work to receive credit on all problems and place your answers in the blank provided. Point value of each problem is listed in the problem statement. Calulators are not allowed on this exam. 1. Given A= 2 3 4 3 9 4 2 , B= 2 6 7 and I= 1 1 , answer the following: (a & b: 2 pts. each; c: 5pts.) a.) What is the size of matrix A: b.) What is a 24 ? c.) What is B 4 I ? 2. Given A = 1 2 5 2 1 , B = 3 2 1 and I = 1 1 , compute the following: a.) A T (3 points) b.) BA (5 points) c.) B 1 (5 points) 3. Place appropriate entries in a 2 × 3 matrix A below so that a ij = 3 i + j . (6 points) 4. Complete each of the following: (4 points each) a.) If A is a 2 × 4 matrix and B is a 4 × 5 matrix, then the size of AB is . b.) If A is a 4 × 5 matrix and B is a 4 × 3 matrix, is the matrix multiplication AB possible? Explain: 5. A novelty toy store buys 3 items, A, B and C, for $1, $2 and $3 respectively. In a recent shipment, they received5....
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 Fall '08
 SMITH
 Math, Optimization, Row vector, matrix multiplication AB

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