# Questions on Algebra: Matrices, determinant, Cramer rule answered by real tutors!

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 Algebra: Matrices, determinant, Cramer rule Solvers Lessons Answers archive Quiz In Depth

 Question 634104: After the private screening of a new television pilot, audience members were asked to rate the new show on a scale of 1 to 10 (10 being the highest rating). From a group of 140 people, the following responses were obtained. Rating 1 2 3 4 5 6 7 8 9 10 Frequency of Occurrence 4 4 3 6 17 20 22 24 11 29 Let the random variable X denote the rating given to the show by a randomly chosen audience member. Find the probability distribution associated with these data. Rating 1 2 3 4 5 6 7 8 9 10 P(X = x) Click here to see answer by ewatrrr(10682)

 Question 634329: please help. every time i tried the equation in my calculator it never worked. question: the average number of MP3 players sold weekly at three different stores is given by the matrix. the selling price for the ipod is 240.00, the nano sells for 199.00 and the zen sells for 99.00. use the matrix multiplication to find revenue for each store. ipod nano zen circuitcity 50 75 80 bestbuy 45 79 63 target 58 67 98 Click here to see answer by jsmallt9(3296)

 Question 636091: using x,y,and z as variables write the system for linear equations [9,1,0,8,|6] [-1,5,1,0|-12] [7,0,0,3|-9] [0,4,0,-4|8] Click here to see answer by jim_thompson5910(28705)

 Question 636095: write the augmented matrix for the following system of equations 7x+4y+5z=62 5x+3y+2z=47 3x+7y+8z=63 Click here to see answer by jim_thompson5910(28705)

 Question 636099: write the augmented matrix for the following system of equations x-7y+z=15 y+6z=14 z=11 Click here to see answer by jim_thompson5910(28705)

 Question 636094: write the system of linear equations represented by the following augmented matrix [9,4,5|-2] [5,0,9|4] [8,5,0|2] Click here to see answer by jim_thompson5910(28705)

 Question 636121: write the augmented matrix for the following system of equations: 2x+7z=64 8y+6z=40 3x-2y+4z=46 Click here to see answer by jim_thompson5910(28705)

 Question 636123: use Cramer's rule to solve the given system: 2x+2y=32 2x-3y=-3 Click here to see answer by jim_thompson5910(28705)

 Question 636122: solve the following system of equations using matrices: x+y+z=-9 x-y+5z=-19 5x+y+z=-29 Click here to see answer by ewatrrr(10682)

 Question 636414: Solve: If A= [2 3] and B = [0 -2], find AB. [1 4] [1 5] the 1 and 4 are under 2 and 3, the 1 and 5 are under 0 and -2. Click here to see answer by jim_thompson5910(28705)

 Question 636648: Solve using matrices. If the system has no solution, say that it is inconsistent. 2x+y+z=5 4x-y-3z=1 8x+y-z=5 Click here to see answer by stanbon(57960)

 Question 637361: 2xa-3xb=1.313 4xb-3xc=1.906 xa-xc=3.784 use cramer's rule to determine the value of Xa, Xb and Xc Click here to see answer by ewatrrr(10682)

 Question 638757: Evaluate the determinate in the matrix. |7 9| |-2 -5| Click here to see answer by Alan3354(31513)

 Question 639488: Good day If i have the following matrices : A= x^2 +4, log1 a+2 , b and B= 4, y 3a-1, -1 To get A=B the unknowns must assume the following values A. x = -2 , y = 0 , a = - 3/2 , b = -1 B. x = +2 , y = 0 , a = 3/2 , b = -1 C. x = 0 , y = 0 , a = 3/2 , b = -1 D. x = ±2 , y = 1 , a = -3/2 , b = 1 Thanks Click here to see answer by lynnlo(4169)

 Question 640341: hello sir, can you tell me, how we know that which Row(column) operation should we use in the first step of determinant when we are solving it....i am asking it because you know determinant has many ways to solve. for ex: Let A be a determinant. |29 26 22| A = |25 31 27| |63 54 46| it has many ways to solve, some give exact answer and some wrong answer. then how we know which operation we have to apply?? kindly reply fast. Click here to see answer by Edwin McCravy(8999)

 Question 640638: 3/x-4/y+6/z=1 9/x+8/y-12/z=3 9/x-4/y+12/=4 solve for D, Dx, Dy, Dz and x, y, z tnx..xD Click here to see answer by jim_thompson5910(28705)

 Question 642950: Can someone help with 6x + y = 19 and 5x = 2y = 31 solved via Gauss - Jordan Method? Im stuck at [1 * * 0 * * ] Click here to see answer by solver91311(17077)

 Question 643644: which of the following inequality signs would make a true statement if ti replaced the question mark in the following equation 3-5?-3 Click here to see answer by solver91311(17077)

 Question 643649: Slove the inequality -4y+6 <-14 A. y>2 B. Y<5 c. Y< 5 d. Y>5 Click here to see answer by solver91311(17077)

 Question 643660: Use matrices to help find a general solution for this system of equations. 2x − y + 3z = 5 –x + 4y + 4z = –1 Click here to see answer by Edwin McCravy(8999)

 Question 643158: How do you find the determinant of a 3x4 matrix? Click here to see answer by jsmallt9(3296)

 Question 645725: how would you write an equation for this problem and solve it? 9.) two investments were made totaling \$8800. for a certain year these investments yielded \$1326 in simple interest. part of the \$8800 was invested at 14% and part at 16%. find the amount invested at each rate. Click here to see answer by solver91311(17077)

 Question 647250: how to find out the rank of the matrix. 0 1 2 -2 4 0 2 6 2 1 3 1 Click here to see answer by aaronwiz(69)

 Question 647295: solve the following set of simultaneous equation by using Gaussian Elimination method : 1/x + 2/y - 1/z = 1 2/x + 4/y - 1/z = 5 3/x + 2/y - 2/z = 0 Click here to see answer by Alan3354(31513)

 Question 647353: A bag contain 3 types of coins namely \$1, \$2, \$5. There are 30 coins amounting to \$100 in total. There are twice as many \$2 coins as \$1 coins. Find the number of coins in each category using Cramer's rule. Click here to see answer by Edwin McCravy(8999)

 Question 647382: Which of the following represents a way to solve the system for x using Cramer's rule? 2x – y = 4 –5x + 3y = 3 Click here to see answer by ewatrrr(10682)

 Question 647443: if you were to use gauss-jordan elimination on the following linear system, what would the augmented matrix be? 3w-x=2y+z-4 9x-y+z=10 4w+3y-z=7 12x+17=2y-z+6 Click here to see answer by Aaniya(63)
 Question 647443: if you were to use gauss-jordan elimination on the following linear system, what would the augmented matrix be? 3w-x=2y+z-4 9x-y+z=10 4w+3y-z=7 12x+17=2y-z+6 Click here to see answer by MathLover1(6810)

 Question 647606: please tell me how you use cramers rule ? use cramers rule to solve the linear system. -x-2y+4z=-28 x+y+2z=-11 2x+y-3z=30 please show steps Click here to see answer by jim_thompson5910(28705)

 Question 647649: calculate the co-factor of the element 2: 1 2 3 3 4 5 5 6 7 Click here to see answer by Edwin McCravy(8999)

 Question 647927: how do you solve this system of equations: 3a-2b+7c=13 a+8b-6c=-47 7a-9b-9c=-3 Click here to see answer by MathLover1(6810)

 Question 647926: how do you solve this system of equations: 2x-3y+z=5 x+3y+8z=22 3x-y+2z=12 Click here to see answer by jim_thompson5910(28705)

 Question 650408: 3z is greater than 6 and z equals 3 Click here to see answer by Alan3354(31513)

 Question 650573: how would you write an equation for this problem and solve it: the sum of three numbers is 5. the first number minus the second plus the third is 1. the first minus the third is 3 more than the second. find the numbers Click here to see answer by stanbon(57960)
 Question 650573: how would you write an equation for this problem and solve it: the sum of three numbers is 5. the first number minus the second plus the third is 1. the first minus the third is 3 more than the second. find the numbers Click here to see answer by MathTherapy(1480)

 Question 651012: = 7 2(4)-11how would i determine whether (2,4,1) is a solution of the following system. 2x-4+z=-11 x+y=6 2y-z=7 Click here to see answer by fcabanski(889)

 Question 651018: how do i determine whether (1,-5,10) is a solution of the following system. x+y+z=6 3x-y-z=-2 2x-y+4z=37 Click here to see answer by Alan3354(31513)
 Question 651018: how do i determine whether (1,-5,10) is a solution of the following system. x+y+z=6 3x-y-z=-2 2x-y+4z=37 Click here to see answer by MathLover1(6810)

 Question 651020: how would i solve these systems -x+y+z=4 -x+2y-3z=-6 2x-4y+8z=18 Click here to see answer by Alan3354(31513)

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