A Bookstore Is Having a Sale $A X = B$ , Which Can Be Solved to Determine the Price Each

question 393

Multiple Choice

A bookstore is having a sale. All books included in the sale have a colored sticker on them to indicate the sale price. There are green stickers, red stickers, and orange stickers. Bob, Sue, and Fred each make purchases of
Books that are on sale. Each row of the table gives information about the numbers of book purchases and the
Total cost of the purchase (before taxes) .

Use this information to set up a matrix equation of the form $A X = B$ , which can be solved to determine the price each type of sale book. Solve this matrix equation to find the price of a book with a green sticker.
Use the fact that for $A = \left[ \begin{array} { l l l } 1 & 2 & 2 \\ 1 & 3 & 2 \\ 1 & 2 & 3 \end{array} \right] , A ^ { - 1 } = \left[ \begin{array} { c r r } 5 & - 2 & - 2 \\ - 1 & 1 & 0 \\ - 1 & 0 & 1 \end{array} \right]$ .

• A) $4.89
• B) $4.96
• C) $4.99
• D) $4.91

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The reduction of total body mass due to efforts to improve fitness, health, or appearance.

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Organic compounds consisting of carbon, hydrogen, and oxygen, that are major sources of energy in the diet of animals, including humans.