a) A hardware store chain sells hammers for $3, flashlights for $5, and lanterns for $7. The store manager tracks the daily purchases at three of the chain's stores in a 3 x 3 matrix. What is the total gross revenue from the flashlights sold at all 3 stores? (matrix is below)
b) How can you use matrix multiplication to solve this problem?
c) What does the product matrix represent?

Question

a) A hardware store chain sells hammers for $3, flashlights for $5, and lanterns for $7. The store manager tracks the daily purchases at three of the chain's stores in a 3 x 3 matrix. What is the total gross revenue from the flashlights sold at all 3 stores? (matrix is below)
b) How can you use matrix multiplication to solve this problem?
c) What does the product matrix represent?

anonymous · Answer

I know the answer to A is $115. I am not understanding B and C

anonymous · Answer

to get the answer for part a, I just multiplied the number of flashlights at each store by the price and added them together. That was easy, but I am confused on what part B and C are asking.