159 Answered Questions for the topic Matrix

01/02/19

Algebra and Trigonometry
a ceramic tile designer has some odd lots of tiles in boxes. a particular box contains square, pentagon and hexagonal tiles. altogether there are 100 tiles. there are 20 more pentagonal tiles than... more
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Matrix

10/23/18

Solve by matrix method
Food I has 3 units of vitamins A, 9 units of vitamin B and 12 units of vitamin C. Food II has 6 units of vitamins A, 9 units of vitamin B and 15 units of vitamin C. Food III has 9 units of vitamins... more
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09/09/18

How do you solve a systems of equations using rref when the system in dependent?
In my case, after I used the rref function on my calculator to solve the equations: x − y + 7z = 3x − y + 8z = 2   It gave the following as a matrix: 1  -1  0  10 0  0  1  -1   I think this... more
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09/09/18

When you have a 4x4 matrix that includes only 3 variable in the system, which variable is d?
Ex: x + y − z = −5x − y − 7z = 70.75x − 0.5y + 0.25z = 18x + y + z = 1   If a=x, b=y, and c=z, what is d?     
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07/30/18

How to determine whether T is linearly independent ? Justify your answer please.
Let S={X1,X2,X3} be a linearly independent set of vectors in R^3. How to determine whether T={2X1 + X2 - 2X3,4X1+ 3X2,3X1 + 2X2 - X3} is linearly independent. Justify your answer please.
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07/27/18

Is this True or False ? Justify please
If X1,X2 and X3 are vectors in R3 such that {X1,X2} and {X1,X3} are linearly independent sets, then {X1,X2,X3} is a linearly independent set.
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07/27/18

Please help me find the matrix X. Justify your answer please.
               2 1 0                   1 0 1Let A = [ 1 0 1 ] and B = [ 2 0 1 ]                0 3 0                  0 1 1 Find the matrix X such that (2X + A)-1 = B.
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07/27/18

Is this True or False ? Justify your answer please.
If A is a 2 x 2 matrix such that AAT (Transpose) = 0, then A = 0.
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06/07/18

Use algebra to solve for X in the matrix.
This is a 2x2 matrices problem. However, I am unable to type the matrices symbol in so I wrote it out.   Given A = 7  ,   x (top row) 15  ,  22 (bottom row). and the determinant for matrix A is... more
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06/01/18

I have to compute the atomic weight of nitrogen and oxygen (with matrix operations)
Nitrogen and oxygen have atomic weights of 14 and 16 respectively. Use the molecular weights of the six nitrogen oxides given below to compute the atomic weights for nitrogen and oxygen, correct... more
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Matrix

04/29/18

How do u calculate the value of W ??
How to find the w value in this matrix equation ??   w    -9 4  w-12   " Determinant is equal to 0 "  
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04/15/18

Express 1/x⁴ + 5x² + 6 into partial fraction
1/x⁴ + 5x² + 6 Express in partial fraction
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Matrix

02/15/18

determine the value of x, x>0 if
2   5                         =3x x    x²
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Matrix Math Math Matrix

01/31/18

Problem with applying matrices to common questions
A person invested $72007200 for 1 year, part at 44%, part at 1111%, and the remainder at 1313%. The total annual income from these investments was $775775. The amount of money invested at 1313% was... more
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01/09/18

If you know all 16 cofactors of a 4 by 4 invertible matrix A.
If you know all 16 cofactors of a 4 by 4 invertible matrix A, how would you find A? 
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Matrix

01/03/18

Show: If (P1 P2) is a permutation matrix, then (P2 P1) is also a permutation matrix.
how to prove Permutation matrix
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Matrix

12/31/17

Matrix Permutation
Show: If(P1 P2)is a permutation matrix, then(P2 P1)is also a permutation matrix.
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Matrix

12/30/17

Permutation Matrix
Show: If P is a permutation matrix, then PT and PH are also permutation matrices.
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11/06/17

Finding det of a matrix after row operations.
Given a 4x4 matrix where R1: a b c d, R2: e f g h, R3: i j k l, R4: m n o p. We know that the determinant of this matrix is 9. What would the new determinant be if the matrix was transformed into... more
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10/31/17

solve the system of equations using the Gauss Jordan Method (2 problems)
label the augmented matrix(A:I), the resulting inverse(I:A^-1), column vector B, column vector of variables X, such that A^-1B=x   3x-5y=-5 6x-11y=-14     along with another problem which... more
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10/31/17

for the following problem (Matrices)
represent the system of equations with a matrix, then convert to an upper triangular form and solve for variables with back substitution: A can is filled with 45 coins: half-dollars, quarters, and... more
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Matrix Matrices

09/27/17

Finding an Unknown Matrix
A=1  -3     2   5 C=1 -1     -1  2(1) Find a matrix B such that AB=C (2) Find a matrix D such that DA=C
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Matrix Math

08/11/17

i have 8 teams. there are 7 different events in my tournament. each team is to play each event once against a different team each time. what does this look like
please help this is driving me crazy
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Matrix

07/25/17

Is it possible to solve a matrix by only having one row and one column of data?
Is it possible to solve a matrix by only having one row and one column of data?    For example:                                                      Consequences                              ... more
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06/25/17

Find the multiplicative inverse of the matrix, if it exists.
Find the multiplicative inverse of the matrix, if it exists.   A =  −5 5          6 4
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