$\"\"$

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(a).

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Mrs.Rivera $\"\"$ s Portfolio:

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No of shares of stock A $\"\"$ .

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No of shares of stock B $\"\"$ .

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No of shares of stock C $\"\"$ .

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No of shares of stock D $\"\"$ .

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The row will have four columns, one for each stock.

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Let the first column represent stock A, the second column represent stock B, the third column represent stock C, and the fourth column represent stock D.

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The row matrix to represent Mrs.Rivera $\"\"$ s Portfolio is $\"\"$ .

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$\"\"$

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(b).

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For each month the prices of each stock can be displayed in $\"\"$ matrices.

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$\"\"$ $\"\"$

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To find the total value of Mrs. Rivera’s portfolio for each month, multiply the $\"\"$ matrix found in part a by each of the $\"\"$ matrices.

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Total value of Mrs. Rivera’s portfolio for July :

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$\"\"$

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Total value of Mrs. Rivera’s portfolio for August :

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$\"\"$

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Total value of Mrs. Rivera’s portfolio for September :

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$\"\"$

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$\"\"$

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(a).

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The row matrix to represent Mrs.Rivera $\"\"$ s Portfolio is $\"\"$ .

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(b).

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The total value of Mrs. Rivera’s portfolio for each month :

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In July, $\"\"$

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In August, $\"\"$ .

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In September, $\"\"$ .