Matrix Quiz

What is a matrix?

• The movie with Keanu Reeves

• A rectangular array of numbers written within brackets

• A method for finding the identity values

• The number of vertical rows

Name the dimensions (or order) of the matrix.

• 4x2

• 2x4

• 8

• 2x8

• 4x8

How many rows are in a 6x3 matrix?

• 6

• 3

• 18

• 9

What is the value of the element a_3,2?

• 6

• 5

• -1

• 0

The prices for different soups are shown in the table. Soups come in two sizes, cup and bowl. Display the data in a matrix.

• 
• 
• 
• 

Add.

• -2   4   -9
  -1   -6   -17
• -8   12   -9
  1   6   17
• -8   4   -9
  15   6   7
• -2   -4   -9
  15   6    7

Subtract

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

The prices for different soups are shown in the table. The restaurant owner needs to raise prices by 20%. Represent the new prices in a matrix.

• 
• 
• 
• 

Write the augmented matrix that corresponds to the system. Maggie goes to the same coffee shop every day and always tips the same amount. On Monday Maggie paid $1.70 for 2 cups of coffee and one doughnut, including tip. On Tuesday she paid $1.65 for two doughnuts and a cup of coffee, including tip. On Wednesday she paid $1.30 for one coffee and one doughnut, including tip.

• 
• 
• 
• 

What is the solution set for this matrix?

• [2, 3, 0]

• [2, 3]

• [0, 1, 2, 3]

• infinitely many solutions

• no solution