Algebra
posted by lizzie .
Can you tell me if these are correct? I am not sure that I understand this.
1. Which is the solution for the determinant?
10 0)
5 7
Answer 70?
2.Which is the solution for the determinant?
1 7)
0 3
Answer 3

Did I answer these correct?
19.Given matrices A, B, and C are all 2x2, determine whether the equation is true for the given matrices.
C(A+B)= CA + CB
Answer False
20.Matrix multiplication is not commutative.
AnswerFalse
21.For matrices, A + B = B + A
AnswerTrue