• Columbia College

• MATH MISC

Post Test: Matrices

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Post Test: Matrices

Name: Date: Instructor:

1

Select the correct answer from each drop-down menu.

One week, a cake shop sold 45 pineapple cakes and 62 chocolate cakes on the weekdays and 55 pineapple cakes and 79 chocolate cakes over

the weekend. Total sales were $3,520 on the weekdays and $4,415 over the weekend. Form a linear system representing this data and create a

matrix.

Question serial: CLZ-2E87-06A8-1EEE

The determinant of the matrix for the pineapple cake is 2,850 3,420 4,350 4,625 . The price of one pineapple cake is

$ 20 25 30 35 .

The determinant of the matrix for the chocolate cake is 4,350 4,625 5,075 5,225 . The price of one chocolate cake is

$ 20 25 30 35 .

2

Select the correct answer.

If the determinant of this matrix is 24, what is the value of b?

A. 4

B. 8

C. 16

D. 20

Question serial: MC-4E1B-1664-599C

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3

Select the correct answer.

Create a matrix for this linear system:

What is the solution of the system?

A.

B.

C.

D.

Question serial: MC-CB80-B746-2BD9

4

Drag each tile to the correct box.

Arrange the entries of matrix A in increasing order of their cofactor values.

Question serial: SQ-E707-47C2-A31A

↓ ↓ ↓ ↓ ↓

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5

Select the correct answer from each drop-down menu.

A music recording company has contracts with two bands. It released a new CD from each band in three countries: Britain, Canada, and

Australia. The company sold a total of 40,000 CDs in Britain, 50,000 in Canada, and 30,000 in Australia. The advertising cost was $2 per CD in

Britain, $1.50 in Canada, and $1 in Australia.