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

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.

Write the matrix

, being sure to label the rows and columns, and explain what it represents.Add the numbers in the corresponding entries.

Write the matrix

, with labels, and explain what it represents. Multiply each entry in matrix

by.

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.

Multilpy matrices and

*together to get matrix*

*.*