Question

video game shop is analyzing its sales performance using matrices. Matrix A contains the unit sales data for each product category (horizontally) per week (vertically). Matrix B contains the unit sales data for weekends for each category (horizontally) per week (vertically). To find the number of games in each product category that were sold each week only on weekdays, which matrix operation must be performed?

Answer 1

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Below are the choices:

A. 

Add matrix A to the inverse of matrix B. 




B. 
Add matrix A to the inverse of matrix A and then subtract it from matrix B. 




C. 
More data is needed to calculate the sales during weekdays. 




D. 
Subtract matrix B from matrix A. 




E. 
Add matrix A to matrix B.

The answer is D.