3-6 Multiplying Matrices. Determine whether each matrix product is defined. If so, state the dimensions of the product. 1. ANSWER: ANSWER: undefined
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1 Determine whether each matrix product is defined. If so, state the dimensions of the product Undefined Find each product, if possible CCSS SENSE-MAKING The table shows the number of people registered for aerobics for the first quarter. Quinn s Gym charges the following registration fees: class-by-class, $165; 11-class pass, $110; unlimited pass, $ Undefined Write a matrix for the registration fees and a matrix for the number of students. b. Find the total amount of money the gym received from aerobics and step aerobic registrations. esolutions Manual - Powered by Cognero Page 1
2 and 12. CCSS SENSE-MAKING The table shows the number of people registered for aerobics for the first quarter. Quinn s Gym charges the following registration fees: class-by-class, $165; 11-class pass, $110; unlimited pass, $239. Determine whether each matrix product is defined. If so, state the dimensions of the product. 15. P 2 3 Q A 5 5 B 5 5 Write a matrix for the registration fees and a matrix for the number of students. b. Find the total amount of money the gym received from aerobics and step aerobic registrations. b. $22,955 Use determine whether the following equations are true for the given matrices. 13. XY YX No; to M 3 1 N X 2 6 Y J 2 1 K S 5 2 T Find each product, if possible. 14. X(YZ) (XY)Z and 21. [ 26 ] 22. Determine whether each matrix product is defined. If so, state the dimensions of the product. 15. P 2 3 Q 3 4 esolutions Manual - Powered by Cognero Page
3 TRAVEL The Wolf family owns three bed and breakfasts in a vacation spot. A room with a single bed is $220 a night, a room with two beds is $250 a night, and a suite is $ Undefined Write a matrix for the number of each type of room at each bed and breakfast. Then write a roomcost matrix. b. Write a matrix for total daily income, assuming that all the rooms are rented. c. What is the total daily income from all three bed and breakfasts, assuming that all the rooms are rented? b. 27. c. $5060 Use, and k 2 to determine whether the following equations are true for the given matrices k(pq) P(kQ) 29. TRAVEL The Wolf family owns three bed and breakfasts in a vacation spot. A room with a single bed is $220 a night, a room with two beds is $250 a night, and a suite is $ PQR RQP No; 32. PR + QR (P + Q)R esolutions Manual - Powered by Cognero Page 3
4 31. PQR RQP 3-6 Multiplying No; Matrices 32. PR + QR (P + Q)R $ b. $ c. $ AUTO SALES A car lot has four sales associates. At the end of the year, each sales associate gets a bonus of $1000 for every new car they have sold and $500 for every used car they have sold. 33. R(P + Q) PR + QR No; 34. CCSS SENSE-MAKING Student Council is selling flowers for Mother s Day. They bought 200 roses, 150 daffodils, and 100 orchids for the purchase prices shown. They sold all of the flowers for the sales prices shown. Use a matrix to determine which sales associate earned the most money. b. What is the total amount of money the car lot spent on bonuses for the sales associates this year? Organize the data in two matrices, and use matrix multiplication to find the total amount that was spent on the flowers. b. Write two matrices, and use matrix multiplication to find the total amount the student council received for the flower sale. c. Use matrix operations to find how much money the student council made on their project. $ b. $ c. $ AUTO SALES A car lot has four sales associates. At the end of the year, each sales associate gets a bonus of $1000 for every new car they have sold and $500 for every used car they have sold. b. $187,500 Use matrices to find each of the following. If the matrix does not exist, write. 36. XY 37. YX Use a matrix to determine which sales associate earned the most money. b. What is the total amount of money the car lot 38. ZY 39. YZ esolutions Manual - Powered by Cognero Page 4
5 46. REASONING If the product matrix AB has 38. ZY 3-6 Multiplying Matrices 39. YZ 43. (XX)Z 44. CAMERAS Prices of digital cameras depend on features like optical zoom, digital zoom, and megapixels. 40. (YX)Z 41. (XZ)X 42. X(ZZ) 43. (XX)Z The 10-mp cameras are on sale for 20% off, and the other models are 10% off. Write a new matrix for these changes. b. Write a new matrix allowing for a 6.25% sales tax on the discounted prices. c. Describe what the differences in these two matrices represent. b. 44. CAMERAS Prices of digital cameras depend on features like optical zoom, digital zoom, and megapixels. c. sales tax 45. BUSINESS The Kangy Studio has packages available for senior portraits. The 10-mp cameras are on sale for 20% off, and the other models are 10% off. Write a new matrix for these changes. b. Write a new matrix allowing for a 6.25% sales tax on the discounted prices. c. Describe what the differences in these two matrices represent. Use matrices to determine the total cost of each package. b. The studio offers an early bird discount of 15% off any package. Find the early bird price for each package. A: $421; B: $274; C: $150; D: $68 b. A: $357.85; B: $232.90; C: $127.50; D: $57.80 esolutions Manual - Powered by Cognero Page 5
6 b. c. sales tax 45. BUSINESS The Kangy Studio has packages available for senior portraits. b. Use matrices to determine the total cost of each package. b. The studio offers an early bird discount of 15% off any package. Find the early bird price for each package. A: $421; B: $274; C: $150; D: $68 b. A: $357.85; B: $232.90; C: $127.50; D: $57.80 c. 46. REASONING If the product matrix AB has dimensions 5 8, and A has dimensions 5 6, what are the dimensions of matrix B? CCSS ARGUMENTS Show that each property of matrices. Scalar Distributive Property b. Matrix Distributive Property c. Associative Property of Multiplication d. Associative Property of Scalar Multiplication d. c(ab) c Substi Distri b. esolutions Manual - Powered by Cognero Page 6 (ca)b Substi
7 Distri (ca)b Substi c(ab) c Subst Distri Com A(cB) Substi 48. OPEN ENDED Write two matrices A and B such that AB BA. a 2, b 1, c 3, d WRITING IN MATH Use the data on Lisa Leslie found at the beginning of the lesson to explain how matrices can be used in sports statistics. Describe a matrix that represents the total number of points she has scored during her career and an example of a sport in which different point values are used in scoring. Sports statistics are often listed in columns and matrices. In this case, you can find the total number of points scored by multiplying the point value matrix, which does not change, by the scoring matrix, which changes after each season. The total number of points for her career can be found by multiplying the scoring matrix S by the point matrix P. Basketball and wrestling use different point values in scoring. 51. GRIDDED RESPONSE The average (arithmetic mean) of r, w, x, and y is 8, and the average of x and y is 4. What is the average of r and w? Carla, Meiko, and Kayla went shopping to get ready for college. Their purchases and total amounts spent are shown in the table below. Sample Answer: 49. CHALLENGE Find the missing values in a 2, b 1, c 3, d WRITING IN MATH Use the data on Lisa Leslie found at the beginning of the lesson to explain how matrices can be used in sports statistics. Describe a matrix that represents the total number of points she has scored during her career and an example of a sport in which different point values are used in scoring. Assume that all of the shirts were the same price, all of the pants were the same price, and all of the shoes were the same price. What was the price of each item? A shirt, $12.95; pants, $15.99; shoes, $23.49 B shirt, $15.99; pants, $12.95; shoes, $23.49 C shirt, $15.99; pants, $23.49; shoes, $12.95 D shirt, $23.49; pants, $15.99; shoes, $12.95 A 53. GEOMETRY Rectangle LMNQ has diagonals that intersect at point P. Which of the following represents point P? Sports statistics are often listed in columns and matrices. In this case, you can find the total number of points scored by multiplying the point value matrix, esolutions Manual - Powered by Cognero Page 7
8 C shirt, $15.99; pants, $23.49; shoes, $12.95 D shirt, $23.49; pants, $15.99; shoes, $ Multiplying Matrices A 53. GEOMETRY Rectangle LMNQ has diagonals that intersect at point P. Which of the following represents point P? 57. F (2, 2) G (1, 1) H (0, 0) J ( 1, 1) H 58. Solve each system of equations. ( 2, 5, 7) 54. SAT/ACT What are the dimensions of the matrix that results from the multiplication shown? 59. (8, 3, 1) 55. A 1 4 B 3 3 C 3 1 D 4 1 E 4 3 D Perform the indicated operations. If the matrix does not exist, write impossible. 60. ( 3, 2, 6) 61. MEDICINE The graph shows how much Americans spent on doctors visits in some recent years and a prediction for Find a regression equation for the data without the predicted value. b. Use your equation to predict the expenditures for c. Compare your prediction to the one given in the graph Sample answer: y x - 231, b. Sample answer: $ billion esolutions Manual - Powered by Cognero Page 8
9 Multiplying Matrices ( 3, 2, 6) 61. MEDICINE The graph shows how much Americans spent on doctors visits in some recent years and a prediction for Find a regression equation for the data without the predicted value. b. Use your equation to predict the expenditures for c. Compare your prediction to the one given in the graph. 64. Translated 3 units to the left and 5 units down and stretched vertically Translated 2 units to the left and 6 units down. Sample answer: y x - 231, b. Sample answer: $ billion c. The value predicted by the equation is significantly lower than the one given in the graph. 62. How many different ways can the letters of the word MATHEMATICS be arranged? 4,989,600 Describe the transformation in each function. Then graph the function. 63. Translated 4 units to the right and 3 units up. 64. esolutions Manual - Powered by Cognero Page 9 Translated 3 units to the left and 5 units down and stretched vertically..
8-8 Differences of Squares. Factor each polynomial. 1. x 9 SOLUTION: 2. 4a 25 SOLUTION: 3. 9m 144 SOLUTION: 4. 2p 162p SOLUTION: 5.
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