EBK ALGEBRA AND TRIGONOMETRY
EBK ALGEBRA AND TRIGONOMETRY
7th Edition
ISBN: 9780137394272
Author: Blitzer
Publisher: VST
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Chapter 9, Problem 56RE

In Exercises 52-55, use Cramers’s Rule to solve each system.

Use the quadratic function y = a x 2 + b x + c

to model the

following data:

x (Age of a Driver) y (Average Number of Automobile Accidents per Day in the United States)
20 400
40 150
60 400

Use Cramer’s Rule to determine values for a, b, and c. Then use the model to write a statement about the average number of automobile accidents in which 30-year-olds and 50-year-olds are involved daily.

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Chapter 9 Solutions

EBK ALGEBRA AND TRIGONOMETRY

Ch. 9.1 - Fill in each blank so that the resulting statement...Ch. 9.1 - Fill in each blank so that the resulting statement...Ch. 9.1 - Prob. 3CVCCh. 9.1 - Prob. 4CVCCh. 9.1 - Fill in each blank so that the resulting statement...Ch. 9.1 - Fill in each blank so that the resulting statement...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 18, write the augmented matrix for...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...
Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 1-8, write the augmented matrix for...Ch. 9.1 - In Exercises 9-12, write the system of linear...Ch. 9.1 - In Exercises 9-12, write the system of linear...Ch. 9.1 - In Exercises 9-12, write the system of linear...Ch. 9.1 - In Exercises 9-12, write the system of linear...Ch. 9.1 - In Exercises 13-18, perform each matrix row...Ch. 9.1 - In Exercises 13-18, perform each matrix row...Ch. 9.1 - In Exercises 13-18, perform each matrix row...Ch. 9.1 - 16. Ch. 9.1 - In Exercises 13-18, perform each matrix row...Ch. 9.1 - In Exercises 13-18, perform each matrix row...Ch. 9.1 - In Exercises 19-20, a few steps in the process of...Ch. 9.1 - In Exercises 19-20, a few steps in the process of...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38 solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38, solve each system of...Ch. 9.1 - { 3x+2y+3z=34x5y+7z=12x+3y2z=6Ch. 9.1 - In Exercises 21-38. solve each system of equal...Ch. 9.1 - In Exercises 21-38, solve each system of equations...Ch. 9.1 - In Exercises 21-38. solve each system of equations...Ch. 9.1 - In Exercises 21-38. solve each system of equations...Ch. 9.1 - Prob. 39ECh. 9.1 - Prob. 40ECh. 9.1 - 41. Find the cubic function Ch. 9.1 - Find the cubic function...Ch. 9.1 - Prob. 43ECh. 9.1 - Prob. 44ECh. 9.1 - Prob. 45ECh. 9.1 - Prob. 46ECh. 9.1 - Prob. 47ECh. 9.1 - Prob. 48ECh. 9.1 - Prob. 49ECh. 9.1 - Write a system of linear equations in three or...Ch. 9.1 - What is a matrix?Ch. 9.1 - Prob. 52ECh. 9.1 - In your own words, describe each of the three...Ch. 9.1 - Prob. 54ECh. 9.1 - What is the difference between Gaussian...Ch. 9.1 - Most graphing utilities can perform row operations...Ch. 9.1 - Prob. 57ECh. 9.1 - Prob. 58ECh. 9.1 - Make Sense? In Exercises 59-62, determine whether...Ch. 9.1 - Prob. 60ECh. 9.1 - Prob. 61ECh. 9.1 - Prob. 62ECh. 9.1 - Prob. 63ECh. 9.1 - Prob. 64ECh. 9.1 - Prob. 65ECh. 9.1 - Prob. 66ECh. 9.1 - Prob. 67ECh. 9.1 - Prob. 68ECh. 9.1 - Prob. 69ECh. 9.1 - Prob. 70ECh. 9.1 - Prob. 71ECh. 9.1 - Prob. 72ECh. 9.1 - Prob. 73ECh. 9.1 - Exercises 72-74 will help you prepare for the...Ch. 9.2 - Fill in each blank so that the resulting statement...Ch. 9.2 - Prob. 2CVCCh. 9.2 - Prob. 3CVCCh. 9.2 - True or false: If (2z+3,5z1,z) is the solution set...Ch. 9.2 - Using Gaussian elimination to solve {...Ch. 9.2 - Prob. 1ECh. 9.2 - Prob. 2ECh. 9.2 - Prob. 3ECh. 9.2 - Prob. 4ECh. 9.2 - Prob. 5ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Prob. 7ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Prob. 10ECh. 9.2 - Prob. 11ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Practice Exercises In Exercises 1-24, use Gaussian...Ch. 9.2 - Prob. 15ECh. 9.2 - Prob. 16ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Prob. 19ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Prob. 22ECh. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - In Exercises 1-24, use Gaussian elimination to...Ch. 9.2 - Prob. 25ECh. 9.2 - Prob. 26ECh. 9.2 - Prob. 27ECh. 9.2 - Prob. 28ECh. 9.2 - Prob. 29ECh. 9.2 - Prob. 30ECh. 9.2 - Prob. 31ECh. 9.2 - Prob. 32ECh. 9.2 - Prob. 33ECh. 9.2 - The vitamin content per ounce for three foods is...Ch. 9.2 - Prob. 35ECh. 9.2 - Prob. 36ECh. 9.2 - Describe what happens when Gaussian elimination is...Ch. 9.2 - Prob. 38ECh. 9.2 - Prob. 39ECh. 9.2 - a The figure shows die intersections of a number...Ch. 9.2 - Make Sense? In Exercises 41—44, determine whether...Ch. 9.2 - Make Sense? In Exercises 41-44, determine whether...Ch. 9.2 - Make Sense? In Exercises 41-44, determine whether...Ch. 9.2 - Prob. 44ECh. 9.2 - Consider the linear system {...Ch. 9.2 - Before beginning this exercise, the group needs to...Ch. 9.2 - You are choosing between two cellphone plans. Data...Ch. 9.2 - Find the inverse of f(x)=3x4.. (Section 2.7....Ch. 9.2 - A chemist needs to mix a 75% saltwater solution...Ch. 9.2 - 50. Solve: cos x tan2 x = 3 cos (Section 6.5....Ch. 9.2 - Exercises 51-53 will help you prepare for the...Ch. 9.2 - Exercises 51-53 will help you prepare for the...Ch. 9.2 - Exercises 51-53 will help you prepare for the...Ch. 9.3 - Fill in each blank so that the resulting statement...Ch. 9.3 - Fill in each blank so that the resulting statement...Ch. 9.3 - Fill in each blank so that the resulting statement...Ch. 9.3 - Fill in each blank so that the resulting statement...Ch. 9.3 - Prob. 5CVCCh. 9.3 - Prob. 6CVCCh. 9.3 - Prob. 7CVCCh. 9.3 - Prob. 8CVCCh. 9.3 - Prob. 9CVCCh. 9.3 - Prob. 10CVCCh. 9.3 - Prob. 1ECh. 9.3 - Prob. 2ECh. 9.3 - Prob. 3ECh. 9.3 - Prob. 4ECh. 9.3 - Prob. 5ECh. 9.3 - Prob. 6ECh. 9.3 - Prob. 7ECh. 9.3 - In Exercises 5-8, find values for the variables so...Ch. 9.3 - Prob. 9ECh. 9.3 - Prob. 10ECh. 9.3 - Prob. 11ECh. 9.3 - Prob. 12ECh. 9.3 - Prob. 13ECh. 9.3 - Prob. 14ECh. 9.3 - Prob. 15ECh. 9.3 - Prob. 16ECh. 9.3 - Prob. 17ECh. 9.3 - Prob. 18ECh. 9.3 - Prob. 19ECh. 9.3 - Prob. 20ECh. 9.3 - Prob. 21ECh. 9.3 - Prob. 22ECh. 9.3 - Prob. 23ECh. 9.3 - In Exercises 17-26, let and Solve each matrix...Ch. 9.3 - In Exercises 17-26, let A=[ 372950 ] and B=[...Ch. 9.3 - Prob. 26ECh. 9.3 - Prob. 27ECh. 9.3 - In Exercises 27-36, find (if possible) the...Ch. 9.3 - Prob. 29ECh. 9.3 - Prob. 30ECh. 9.3 - Prob. 31ECh. 9.3 - Prob. 32ECh. 9.3 - Prob. 33ECh. 9.3 - In Exercises 27-36, find (if possible) the...Ch. 9.3 - Prob. 35ECh. 9.3 - Prob. 36ECh. 9.3 - Prob. 37ECh. 9.3 - Prob. 38ECh. 9.3 - Prob. 39ECh. 9.3 - Prob. 40ECh. 9.3 - Prob. 41ECh. 9.3 - Prob. 42ECh. 9.3 - Prob. 43ECh. 9.3 - Prob. 44ECh. 9.3 - Prob. 45ECh. 9.3 - Prob. 46ECh. 9.3 - Prob. 47ECh. 9.3 - Prob. 48ECh. 9.3 - In Exercises 49-50, suppose that the vertices of a...Ch. 9.3 - Prob. 50ECh. 9.3 - The -5- sign in the figure is shown using 9 pixels...Ch. 9.3 - Prob. 52ECh. 9.3 - Prob. 53ECh. 9.3 - Prob. 54ECh. 9.3 - Prob. 55ECh. 9.3 - Prob. 56ECh. 9.3 - Prob. 57ECh. 9.3 - Prob. 58ECh. 9.3 - Prob. 59ECh. 9.3 - Prob. 60ECh. 9.3 - Prob. 61ECh. 9.3 - 62. The table gives an estimate of basic caloric...Ch. 9.3 - Prob. 63ECh. 9.3 - Prob. 64ECh. 9.3 - Prob. 65ECh. 9.3 - Prob. 66ECh. 9.3 - Prob. 67ECh. 9.3 - How arc matrices added?Ch. 9.3 - Prob. 69ECh. 9.3 - 70. Describe matrices that cannot be added or...Ch. 9.3 - Prob. 71ECh. 9.3 - Prob. 72ECh. 9.3 - Prob. 73ECh. 9.3 - Prob. 74ECh. 9.3 - Prob. 75ECh. 9.3 - Prob. 76ECh. 9.3 - Prob. 77ECh. 9.3 - Prob. 78ECh. 9.3 - Prob. 79ECh. 9.3 - Prob. 80ECh. 9.3 - Prob. 81ECh. 9.3 - Prob. 82ECh. 9.3 - Prob. 83ECh. 9.3 - Prob. 84ECh. 9.3 - Prob. 85ECh. 9.3 - Prob. 86ECh. 9.3 - Prob. 87ECh. 9.3 - Prob. 88ECh. 9.3 - Prob. 89ECh. 9.3 - 88. Use the Law of Sines to solve the triangle...Ch. 9.3 - Prob. 91ECh. 9.3 - Prob. 92ECh. 9.3 - Exercises 89-91 will help you prepare for the...Ch. 9.4 - Fill in each blank so that the resulting statement...Ch. 9.4 - Prob. 2CVCCh. 9.4 - Prob. 3CVCCh. 9.4 - Prob. 4CVCCh. 9.4 - Fill in each blank so that the resulting statement...Ch. 9.4 - Prob. 6CVCCh. 9.4 - Prob. 7CVCCh. 9.4 - Prob. 8CVCCh. 9.4 - Prob. 9CVCCh. 9.4 - In Exercises 1-12, find the products AB and BA to...Ch. 9.4 - Prob. 2ECh. 9.4 - Prob. 3ECh. 9.4 - Prob. 4ECh. 9.4 - In Exercises 1-12, find the products AB and BA to...Ch. 9.4 - Prob. 6ECh. 9.4 - Prob. 7ECh. 9.4 - Prob. 8ECh. 9.4 - Prob. 9ECh. 9.4 - Prob. 10ECh. 9.4 - In Exercises 1-12, find the products AB and BA to...Ch. 9.4 - Prob. 12ECh. 9.4 - Prob. 13ECh. 9.4 - Prob. 14ECh. 9.4 - Prob. 15ECh. 9.4 - Prob. 16ECh. 9.4 - Prob. 17ECh. 9.4 - Prob. 18ECh. 9.4 - Prob. 19ECh. 9.4 - Prob. 20ECh. 9.4 - Prob. 21ECh. 9.4 - Prob. 22ECh. 9.4 - Prob. 23ECh. 9.4 - Prob. 24ECh. 9.4 - Prob. 25ECh. 9.4 - Prob. 26ECh. 9.4 - Prob. 27ECh. 9.4 - Prob. 28ECh. 9.4 - Prob. 29ECh. 9.4 - Prob. 30ECh. 9.4 - Prob. 31ECh. 9.4 - Prob. 32ECh. 9.4 - Prob. 33ECh. 9.4 - Prob. 34ECh. 9.4 - Prob. 35ECh. 9.4 - Prob. 36ECh. 9.4 - Prob. 37ECh. 9.4 - Prob. 38ECh. 9.4 - Prob. 39ECh. 9.4 - Prob. 40ECh. 9.4 - Prob. 41ECh. 9.4 - Prob. 42ECh. 9.4 - Prob. 43ECh. 9.4 - Prob. 44ECh. 9.4 - Prob. 45ECh. 9.4 - Prob. 46ECh. 9.4 - Prob. 47ECh. 9.4 - Prob. 48ECh. 9.4 - Prob. 49ECh. 9.4 - Prob. 50ECh. 9.4 - Prob. 51ECh. 9.4 - Prob. 52ECh. 9.4 - Prob. 53ECh. 9.4 - Prob. 54ECh. 9.4 - Prob. 55ECh. 9.4 - Prob. 56ECh. 9.4 - Explain why a matrix that does not have the same...Ch. 9.4 - 58. Explain how to find the multiplicative inverse...Ch. 9.4 - Prob. 59ECh. 9.4 - Prob. 60ECh. 9.4 - Prob. 61ECh. 9.4 - Prob. 62ECh. 9.4 - Prob. 63ECh. 9.4 - A year has passed since Exercise 63. (Tune flies...Ch. 9.4 - Prob. 65ECh. 9.4 - Prob. 66ECh. 9.4 - Prob. 67ECh. 9.4 - Prob. 68ECh. 9.4 - Prob. 69ECh. 9.4 - Prob. 70ECh. 9.4 - Prob. 71ECh. 9.4 - Prob. 72ECh. 9.4 - Prob. 73ECh. 9.4 - Prob. 74ECh. 9.4 - Prob. 75ECh. 9.4 - Prob. 76ECh. 9.4 - Prob. 77ECh. 9.4 - Prob. 78ECh. 9.4 - Prob. 79ECh. 9.4 - Prob. 80ECh. 9.4 - Prob. 81ECh. 9.4 - Prob. 82ECh. 9.4 - Prob. 83ECh. 9.4 - Prob. 84ECh. 9.4 - Prob. 85ECh. 9.4 - Prob. 86ECh. 9.4 - Prob. 87ECh. 9.4 - Prob. 88ECh. 9.4 - Give an example of a 22 matrix that is its own...Ch. 9.4 - Prob. 90ECh. 9.4 - Prob. 91ECh. 9.4 - Prob. 92ECh. 9.4 - Prob. 93ECh. 9.4 - Prob. 94ECh. 9.4 - Prob. 95ECh. 9.4 - Prob. 96ECh. 9.4 - Prob. 97ECh. 9.4 - Prob. 98ECh. 9.4 - Prob. 99ECh. 9.5 - 1. The value of this second-order_________...Ch. 9.5 - Using Cramers Rule to solve { x+y=8xy=2 we obtain...Ch. 9.5 - | 321431511 |=3| |4| |Ch. 9.5 - Prob. 4CVCCh. 9.5 - Prob. 5CVCCh. 9.5 - Evaluate each determinant in Exercises 1-10. 1. Ch. 9.5 - Evaluate each determinant in Exercises 1-10. 2. Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. 4. Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. |...Ch. 9.5 - Evaluate each determinant in Exercises 1-10. 10. Ch. 9.5 - For Exercises 11-22, use Cramer’s Rule to solve...Ch. 9.5 - Prob. 12ECh. 9.5 - Prob. 13ECh. 9.5 - Prob. 14ECh. 9.5 - Prob. 15ECh. 9.5 - Prob. 16ECh. 9.5 - Prob. 17ECh. 9.5 - Prob. 18ECh. 9.5 - Prob. 19ECh. 9.5 - Prob. 20ECh. 9.5 - Prob. 21ECh. 9.5 - Prob. 22ECh. 9.5 - Prob. 23ECh. 9.5 - Prob. 24ECh. 9.5 - Prob. 25ECh. 9.5 - Prob. 26ECh. 9.5 - Prob. 27ECh. 9.5 - Prob. 28ECh. 9.5 - Prob. 29ECh. 9.5 - Prob. 30ECh. 9.5 - Prob. 31ECh. 9.5 - Prob. 32ECh. 9.5 - Prob. 33ECh. 9.5 - Prob. 34ECh. 9.5 - Prob. 35ECh. 9.5 - Prob. 36ECh. 9.5 - In Exercises 29-36, use Cramer's Rule to solve...Ch. 9.5 - In Exercises 29-36, use Cramer's Rule to solve...Ch. 9.5 - In Exercises 29-36, use Cramer's Rule to solve...Ch. 9.5 - Prob. 40ECh. 9.5 - Prob. 41ECh. 9.5 - Prob. 42ECh. 9.5 - Prob. 43ECh. 9.5 - Prob. 44ECh. 9.5 - Prob. 45ECh. 9.5 - Prob. 46ECh. 9.5 - Prob. 47ECh. 9.5 - Prob. 48ECh. 9.5 - Evaluate each determinant in Exercises 37-40....Ch. 9.5 - Prob. 50ECh. 9.5 - Evaluate each determinant in Exercises 37-40. |...Ch. 9.5 - Prob. 52ECh. 9.5 - Prob. 53ECh. 9.5 - Prob. 54ECh. 9.5 - Prob. 55ECh. 9.5 - Prob. 56ECh. 9.5 - Prob. 57ECh. 9.5 - Prob. 58ECh. 9.5 - Prob. 59ECh. 9.5 - Prob. 60ECh. 9.5 - Prob. 61ECh. 9.5 - Prob. 62ECh. 9.5 - Prob. 63ECh. 9.5 - Prob. 64ECh. 9.5 - Prob. 65ECh. 9.5 - Prob. 66ECh. 9.5 - Prob. 67ECh. 9.5 - Prob. 68ECh. 9.5 - Prob. 69ECh. 9.5 - Prob. 70ECh. 9.5 - Prob. 71ECh. 9.5 - Prob. 72ECh. 9.5 - Prob. 73ECh. 9.5 - Prob. 74ECh. 9.5 - Prob. 75ECh. 9.5 - Prob. 76ECh. 9.5 - Prob. 77ECh. 9.5 - Prob. 78ECh. 9.5 - Prob. 79ECh. 9.5 - Prob. 80ECh. 9.5 - Prob. 81ECh. 9.5 - Prob. 82ECh. 9.5 - Prob. 83ECh. 9.5 - Prob. 84ECh. 9.5 - Prob. 85ECh. 9.5 - Prob. 86ECh. 9.5 - Prob. 87ECh. 9.5 - Prob. 88ECh. 9.5 - Prob. 89ECh. 9.5 - Prob. 90ECh. 9.5 - Prob. 91ECh. 9.5 - Prob. 92ECh. 9.5 - Prob. 93ECh. 9.5 - Prob. 94ECh. 9.5 - Prob. 95ECh. 9 - In Exercises 1-5, use matrices to find the...Ch. 9 - In Exercises 1-5. use matrices to find the...Ch. 9 - Prob. 3MCCPCh. 9 - Prob. 4MCCPCh. 9 - Prob. 5MCCPCh. 9 - Prob. 6MCCPCh. 9 - Prob. 7MCCPCh. 9 - Prob. 8MCCPCh. 9 - Prob. 9MCCPCh. 9 - Prob. 10MCCPCh. 9 - Prob. 1RECh. 9 - Prob. 2RECh. 9 - Prob. 3RECh. 9 - Prob. 4RECh. 9 - Prob. 5RECh. 9 - Prob. 6RECh. 9 - Prob. 7RECh. 9 - Prob. 8RECh. 9 - Prob. 9RECh. 9 - Prob. 10RECh. 9 - Prob. 11RECh. 9 - Prob. 12RECh. 9 - Prob. 13RECh. 9 - Prob. 14RECh. 9 - Prob. 15RECh. 9 - Prob. 16RECh. 9 - Prob. 17RECh. 9 - Prob. 18RECh. 9 - Prob. 19RECh. 9 - Prob. 20RECh. 9 - Prob. 21RECh. 9 - Prob. 22RECh. 9 - Prob. 23RECh. 9 - Prob. 24RECh. 9 - Prob. 25RECh. 9 - Prob. 26RECh. 9 - Prob. 27RECh. 9 - Prob. 28RECh. 9 - Prob. 29RECh. 9 - Prob. 30RECh. 9 - Prob. 31RECh. 9 - Prob. 32RECh. 9 - The figure shows a right triangle in a rectangular...Ch. 9 - Prob. 34RECh. 9 - Prob. 35RECh. 9 - Prob. 36RECh. 9 - Prob. 37RECh. 9 - Prob. 38RECh. 9 - Prob. 39RECh. 9 - Prob. 40RECh. 9 - Prob. 41RECh. 9 - Prob. 42RECh. 9 - Prob. 43RECh. 9 - Prob. 44RECh. 9 - Prob. 45RECh. 9 - Prob. 46RECh. 9 - Prob. 47RECh. 9 - Prob. 48RECh. 9 - Prob. 49RECh. 9 - Prob. 50RECh. 9 - Prob. 51RECh. 9 - Prob. 52RECh. 9 - Prob. 53RECh. 9 - Prob. 54RECh. 9 - Prob. 55RECh. 9 - In Exercises 52-55, use Cramers’s Rule to solve...Ch. 9 - Prob. 1TCh. 9 - Prob. 2TCh. 9 - Prob. 3TCh. 9 - Prob. 4TCh. 9 - Prob. 5TCh. 9 - Prob. 6TCh. 9 - Prob. 7TCh. 9 - Prob. 8TCh. 9 - Prob. 9TCh. 9 - Prob. 10TCh. 9 - Prob. 1CRECh. 9 - Prob. 2CRECh. 9 - Prob. 3CRECh. 9 - Prob. 4CRECh. 9 - Prob. 5CRECh. 9 - Prob. 6CRECh. 9 - Prob. 7CRECh. 9 - Prob. 8CRECh. 9 - Prob. 9CRECh. 9 - Prob. 10CRECh. 9 - Prob. 11CRECh. 9 - Prob. 12CRECh. 9 - Prob. 13CRECh. 9 - Prob. 14CRECh. 9 - Prob. 15CRECh. 9 - Prob. 16CRECh. 9 - Prob. 17CRECh. 9 - Prob. 18CRECh. 9 - Prob. 19CRECh. 9 - Prob. 20CRECh. 9 - Prob. 21CRECh. 9 - Prob. 22CRECh. 9 - Prob. 23CRECh. 9 - Prob. 24CRECh. 9 - Prob. 25CRE
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