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Home > A2C > Chapter 7 > Lesson 7.3.1 > Problem 7-156

7-156.
  1. Shola's Bakery uses sugar, eggs, and butter in all of its cakes, as well as in the frosting. Matrix C shows how many eggs, cups of sugar, and ounces of butter are used in each angel food cake and in each devil's food cake. Matrix F shows how many eggs, cups of sugar, and ounces of butter are used in the frosting for each cake. Homework Help ✎ Matrix C and Matrix F

    1. Write the matrix C + F, being sure to label the rows and columns, and explain what it represents.

    2. Write the matrix 3C, with labels, and explain what it represents.

    3. Leora orders three angel food cakes and two devil's food cakes without frosting, as represented by the matrix L at right. Use matrix multiplication to write a matrix that shows how much sugar, eggs, and butter Shola will need to fill Leora's order.
      Matrix L

Add the numbers in the corresponding entries.

Multiply each entry in matrix C by 3.

Multilpy matrices L and C together to get matrix LC.