Mathematics
Vectors and Matrices

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Graded Assignment MTH302B: Algebra II | Unit 6 | Lesson 10: Unit Test Name: Date: Graded Assignment Unit Test, Part 2: Vectors and Matrices Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. (12 points) 1. The matrices show the numbers of different types and sizes of sweaters that a clothing store has in stock. Boys Girls Small Medium Large Small Medium Large Button 24 Zipper  32 11 8 16  14  Button  7 Zipper 32 15 9 Score 26  21 a. Add theese matrices. Label the new matrix A. Describe what matrix A represents. b. What does element a12 represent? c. If you add all the elements in the second row of matrix A, what would this number represent? d. How many large sweaters does the store have in stock? Tell how you can use matrix A to determine the answer. e. Write a matrix that represents how many more girls than boys button and zipper sweaters the store has in stock in each size. Answer: © 2010 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 2 Graded Assignment MTH302B: Algebra II | Unit 6 | Lesson 10: Unit Test (7 points) 2. The first matrix shows the cost of two types of sweaters (in dollars), and the second matrix shows the number of each type sold during different months. Cost Button Zipper 22 18  Score Nov. Dec. Jan. Feb. Button  5 Zipper 25 18 40 32 38 40  12 a. Multiply the matrices. b. How much more money was spent on sweaters sold in January than in December? Tell how to use your answer from part a to answer this question. Answer: (6 points) 4 x + 3 y = 4 3. Use Cramer’s rule to solve  . Show your work. −3 x − y = 7 Score Answer: Your Score © 2010 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 25 Page 2 of 2 ...
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