Matrix applications

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

What is the name of each entry of a matrix?

• Row

• Element

• Dimension

• Numbers

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

In Matrix R (pictured) what element is r₂₃?

• 8

• 9.01

• 6

• 1

Add

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

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

• only Ms. Jones knows

What is the value of element a₂₃?

• 2

• -1

• 6

• 1

If the matrices can be multiplied, what dimension is the product? If not, write undefined.

• ( 2 x 2 )

• ( 6 x 2)

• ( 2 x 6 ) )

• ( 3 x 2 )

If the matrices can be multiplied, what dimension is the product? If not, write undefined.

• undefined

• ( 3 x 1 )

• ( 1 x 2 )

• ( 3 x 2 )