Multiplying Matrices

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

These matrices are being multiplied. Determine the dimension/size of the new matrix. 

• Can't multiply them
• 4  x  2
• 3  x  3
• 4  x  3

• A

• B

• C

• D

• A

• B

• C

• D

• E

• 
• 
• 
• 
• It is not possible.

Hint; which of the following multiplications is possible?

• AB

• BA

• BC

• A

• B

• C

• D

The table below shows the number of different types of rooms in three hotels owned by a company. If a single room costs $160 per night, a double room costs $430 per night, and a suite costs $740 per night, determine the company’s daily income when all the rooms are occupied.

Write your answer as a figure only without commas.

• A

• B

• C

• D

• E

Given matrices A & B:  A is a (4 X 5) matrix B is a (5 X 1) matrix  What are the dimensions of the product of A times B?

• 4x1
• 4x33
• 33x1
• Matrix does not exist