What is the determinant of b? a. −27 b. −30 c. 30 d. –6

Answer B:  -30

Step-by-step explanation:

Let B be as follows:

[-18 3]

[4    1 ]

To find the determinant, multiply diagonally downward from -18 through 1, obtaining -18.  We keep this sign as is.

Continue:  Start at 4 and move diagonally upward through 3; this product is 12. Because we moved upward, give this result the opposite sign:  -12.

Now add together these two products; that is, add together -18 and -12.  Here the sum is -30.  This is the determinant of the matrix.  It's Answer B.

Finding the determinant of a 3x3 matrix obviously requires more steps, but the general approach is similar.

first one is a: renaming a fraction. second one is c: de-c

step-by-step explanation:

my explanation is that these were the answers on edg : )