Adding, Subtracting, and Multiplying Matrices by Scalars

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

In Matrix R (pictured) what is the value of element R_3,2

• 8
• 9.01
• 6
• 1

Subtract

• -5
  -8
  3
  10
• -9
  8
  3
  2
• 5
  -8
  3
  10
• -5
  8
  3
  2

In Matrix R (pictured) what element is in the second row, third column?

• 8
• 9.01
• 6
• 1

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

Find A-B

• -1 6 -3

  -9 7 9

• -1 -2 3

  9 -1 -3

• -1 -6 3

  9 -7 9

• -1 -6 -3

  -9 -7 9

Add

• 11    8
  -4     2
• 3     2
  -6    -6
• -3    2
  -4    -6
• 10    8
  -6    2

Subtract

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

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 are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6