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Question: answer all question plz with formula ...

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Answer all question plz !!!!!!!!! with formula !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

4. Test whether the following matrices are nonsingular: 7 -1 0 (c)11 4 13 -3 -4 (a)19 3 -4 9 5 (d)3 0 1 10 8 6 4 -2 1 (b)-5 6 0 5. What can you conclude about the rank of each matrix in Prob. 4? 7. Rewrite the simple nationa-income model (3.23) in the Ax d format (with Y as the first variable in the vector x), and then test whether the coefficient matrix A is nonsingular.

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