Matrices #2 Practice

Add

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

Subtract

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

Find A-B

• -3     1
  7     -1
• 1     0
  1     -4
• -4       0
  6     -1
• not possible because rows do not match columns

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

What comes first in the order?

• Row
• Column

Multiply

• 20     15    -10
  30     -5         0
• -20      15     -10
  30     -5          0
• 1        8       3
  11     4        5
• 20     -15     10
  -30         5        0  

Can the operation be performed?

• Yes

• No

• Sometimes

Find A-B

• -3 1

  7 -1

• 1 0

  1 -4

• -4 0

  6 -1

• not possible because rows do not match columns

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

• 8
• 9.01
• 6
• 1

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10