Matrices

What do m, n, p and q equal in this scalar matrix multiplication?

• m=8, p=-4, n=9, q=4

• m=15, p=20, n = -45, q=-5

• m=20, p=15, n=-5, q=-45

• m=-5, p=-45, n=20, q=15

Find the determinant of matrix A.

• 10

• not possible

• 14

• -14

You can multiply a 2X3 matrix by which matrix (The 2x3 matrix is the first matrix)?

• 2X2

• 2X12

• 3X12

• 2X3

Which matrix does NOT have an inverse?

• A

• B

• C

• D

Add these two matrices

• 10    -3    15
  -6      1     9

• 10    8    3
  -17   1    4
  12    5    0

• 10     8
  -17    1

• undefined

Perform the operation if possible.

• A

• B

• C

• D

Perform the operation if possible.

• A

• B

• C

• D

What do w, x, y and z equal in this matrix subtraction?

• w = 13, x = 4, y = 7, z = 23

• w = 13, x = -4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 17

What is the entry at r₃₁?

• 3

• 1

• 4

• 7

• w= -5 ; x= -3 ; z= 5 ; y=5

• w= 1 ; x =3 ; z= 7; y = 5

• w= 5 ; x= 3 ; z= 5 ; y=5

• w= -5 ; x= 3 ; z= 5 ; y=5