questions below:

3 59 -3 Let u= 9 and A = | 2 1 1 4 . Is u in the subset of R spanned by the columns of A? Why or why not? - 2 1 3 -3 . . . Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or decimal for each matrix element.) O A. No, the reduced row echelon form of the augmented matrix is , which is an inconsistent system. O B. Yes, multiplying A by the vector writes u as a linear combination of the columns of A.Verify that uj ,U2 is an orthogonal set, and then find the orthogonal projection of y onto Span {u, , U2}- 7 - 5 y = 6 U1 5 U, = 3 O . . . To verify that fu1,U2) is an orthogonal set, find u, . U2. up . u2 (Simplify your answer.) The projection of y onto Span qu1 , U2) is (Simplify your answers.)Compute the determinant by cofactor expansion. At each step, choose a row or column that involves the least amount of computation. 9 2 3 4 0 2 0 -3 1 0 2 -7 3 7 1 4 0 0 0 0 8 2 4 3 0 9 2 340 2 0 -3 1 0 2 -7 3 7 1 = (Simplify your answer.) 4 0 0 0 0 8 2 4 3 0