Matrices

Perform the operations if possible.

• A

• B

• C

• D

What is the name of each entry of a matrix?

• Row

• Element

• Dimension

• Rectangle

Which sums can NOT be made from the following matrices ?

• A+A

• A+C

• B+D

• C+C

• 8

• 6

• -5

• 5

How would a scalar multiplication be carried out for a matrix?

• Add the Scalar to every element in the matrix

• Dot product the rows of one matrix with the columns of the other matrix

• Multiply every element with the scalar to create a new matrix

• subtract the elements in the first matrix from the elements of the second matrix

Calculate the determinant

• 0

• none

• -32

• -8

Calculate the determinant

• 0

• -15

• -70

• 10

What size is this matrix?

• 2x2

• 2x3

• 3x2

• 1x6

Which of the following is the inverse of the matrix A= 
⌈3  0⌉
⌊0  2⌋
*Inverse=
                 ¹∕detA × ⌈d  −b⌉                                      ⌊−c  a⌋

• [1/2    0]
  [0    1/3]

• [-3  0]
  [0  -2]

• ⌈1/3   0⌉
  ⌊0   1/2⌋

• [2  0]
  [0  3]

What is the entry at f₄₂?

• 23

• -81

• -44

• 99

• -56