Algebra

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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

  • Algebra -

    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.
    Answer-False

    21.For matrices, A + B = B + A
    Answer-True

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