# Math Help - Tables word problem - finding matrices

1. ## Tables word problem - finding matrices

Need help with word problem:

The following tables give the number of shares of stocks of certain corporations held by Adam and Bob at the end of September and October:

September
|IBM|GE|Walmart|
Bob........... |700|200|300|

October
|IBM|GE|Walmart|
c) If the prices (in dollars per share) of stocks IBM, GE, and Walmart at the close of the stock market on October 31 were $110,$50, and $60, respectively, use the matrix operation to find the values of the portfolios of Adam and Bob in the form of a matrix. 2. Originally Posted by samanthaleigh Need help with word problem: The following tables give the number of shares of stocks of certain corporations held by Adam and Bob at the end of September and October: September |IBM|GE|Walmart| Adam......... |250|500|400| Bob........... |700|200|300| October |IBM|GE|Walmart| Adam.........|300|400|550| Bob.......... |800|300|250| a) Write the matrices A and B giving the stock portfolios of Adam and Rob at the end of September and the end of October, respectively. That is exactly what you are given! For example, $A= \begin{bmatrix}250 & 500 & 400 \\ 700 & 200 &300\end{bmatrix}$ b) Find a matrix C reflecting the change in the stock portfolios of Adam and Bob between the end of September and the end of October.] Find A- B. c) If the prices (in dollars per share) of stocks IBM, GE, and Walmart at the close of the stock market on October 31 were$110, $50, and$60, respectively, use the matrix operation to find the values of the portfolios of Adam and Bob in the form of a matrix.
Set up the column matrix $V= \begin{bmatrix}110 \\ 50 \\ 60\end{bmatrix}$ and multiply BV.