Matrix Re

What is the name of each entry of a matrix?

• Row

• Element

• Dimension

• Numbers

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

In Matrix R (pictured) what element is r₂₃?

• 8

• 9.01

• 6

• 1

Classify the matrix

• Square matrix,  Diagonal matrix

• Triangular matrix, Diagonal matrix

• Square matrix, Identity matrix

• Square matrix, triangular matrix

You can multiply a 2X3 matrix by which matrix?

• 2X2

• 2X12

• 3X12

• 2X3

Given matrices A & B: 
A is a (4x33) matrix
B is a (33x1) matrix
 What are the dimensions of the product of A times B?

• 4x1

• 4x33

• 33x1

• Matrix does not exist

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

find the value of m, n, p and q.

• m=8, n=9, p=-4, q=4

• m=15, n = -45, p=20, q=-5

• m=20, n=-5, p=15, q=-45

• m=-5, n=20, p=-45, q=15

Determine whether the matrix product A_3x2 B_2x5 is defined. If so, what are the dimensions of the product.

• no

• yes, 2 x 5

• yes , 3 x 5

• yes , 2 x 3

find: B x A

• 47 30

  9 5

• 17 15

  42 35

• 47 9

  30 5

• not possible because rows do not match columns