Question: INVESTMENT PORTFOLIOS The following table gives the number of shares of certain corporations held by Olivia and Max in their stock portfolios at the beginning of September and at the beginning of October:
![1149_A.png](https://secure.tutorsglobe.com/CMSImages/1149_A.png)
a. Write matrices A and B giving the stock portfolios of Olivia and Max at the beginning of September and at the beginning of October, respectively.
b. Find a matrix C reflecting the change in the stock portfolios of Olivia and Max between the beginning of September and the beginning of October.