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
Respond to this Question
Similar Questions

economics
Any nonprice determinant will have an effect on demand. I really don't know how computer engineers could increase the interest in pc's, but it's not a price determinant and it increases demand. I'm not really sure what the effect … 
Alg II
When you are solving a matix equation and the determinant of your coefficient matrix is zero, how can you determine when it is a no solution versus an infinitely many solution? 
math
I need help with this problem: finding the instantaneous rate of change of y with respect to x at the point x=5 if y=x^2/2+3/5x1 I know I am suppose to find the determinant first then plug in 5...but I am not sure about the determinant 
algebra
1 A + (B + C)= (A + B) + C associative scalar quantity dot product 2 2 2 3 Two systems of linear equations involving the same variables are said to be _______ if they have the same solution set. set associative equivalent parallel … 
Algebra
I have to compute the determinant of the matrix without using a calculator. If the determinant is zero, write singular matrix. 1 1 1 4 2 0 0 3 1 
Linear Algebra
Suppose C and D and 5x5 matrices and det(C)=5, det(D)=6. Compute the determinant of the matrix 3C^T (4CD)^1 C^2. Justify your answer by stating explicitly which calculation rules for the determinant you use. 
Algebra 2
1. What is the determinant of the matrix? 
Math
Evaluate the determinant of each matrix 3 2 3 0 1 1 3 0 3 My answer is 36 The correct answer is 24 but I don't understand how they got the answer. 
Math
What is the determinant of a square matrix whose entry or element is digit or number. For example (100). Please tell me method of finding the determinant of this matrix. 
Algebra 2
What is the solution for the determinant?