Matrix Review Adding and Subtraction

Find X - V

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• 
• Does Not Exist

Find (W + Y) - V

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• 
• 
• Does Not Exist

Which of these matrices are SQUARE matrices? Check all that apply!

• V

• W

• X

• Y

• Z

Algebra High cheerleaders are selling sweatshirts for the Football Team. The inventory of sweatshirts as well as sweatshirts sold on A-Days and B-Days are given in the matrices. Which matrix shows the total of sweatshirts sold in each category, color/size, by the cheerleaders?

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• 
• 
• 

Which matrix shows the inventory of sweatshirts remaining after the B-Day sales?

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• 
• 
• 

Which matrix shows the inventory of sweatshirts remaining after both A-Day & B-Day sales?

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• 
• 
• 

How many black sweatshirts were sold in total by both A-Day & B-Day cheerleaders?

• 113

• 45

• 68

• Can't Be Determined.

How many small sweatshirts were sold in total by both A-Day & B-Day cheerleaders?

• 39

• 30

• 69

• Can't Be Determined.

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2