Answer with Step-by-step explanation:
We are given that
A and B are matrix.
A.We know that for two square matrix A and B
Then, 
Therefore, it is true.
B. det A is the product of diagonal entries in A.
It is not true for all matrix.It is true for upper triangular matrix.
Hence, it is false.
C.

When is a factor of the characteristics polynomial of A then -5 is an eigenvalue of A not 5.
Hence, it is false.
D.An elementary row operation on A does not change the determinant.
It is true because when an elementary operation applied then the value of matrix A does not change.
Answer:
$80
Step-by-step explanation:
A P E X
the numbers are: 100,500 ; 655,980 ; 324,000 ; 900,378
least to greatest: 100,500 ; 324,000 ; 655,980 ; 900,378
Answer:
More expensive: Miami, Honolulu
Less expensive: Seattle, Orlando