What is the determinant of an identity matrix?
–10
–1
0
1

The determinant of the identity matrix In is always 1, and its trace is equal to n.

Step-by-step explanation: that determinant is equal to the determinant of an N minus 1 by n minus 1 identity matrix which then would have n minus 1 ones down its diagonal and zeros off its diagonal.

my answer is$ 12

step-by-step explanation:

because 15 -2=12

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.