Determinants — Unit test Answers

What is the determinant of the coefficient matrix of the system ?

The matrix below represents the number of minutes four friends spend driving to each others’ homes each week. A row label represents the friend driving and a column label represents the friend being visited.How many minutes does friend #1 spend driving to visit friend #3?

Which expression represents the determinant of ?

Which is an augmented matrix for the system of linear equations below?

Mateus created a matrix using the elements below.What type of matrix did Mateus create?