-2-6-28 Let A = 3 5 18 1 2 9 1 Find the third column of A without computing the other two columns. How can the third column of Abe found without computing the other columns? A. Solve the equation Aе3 = b for e3, where e3 is the third column of 13 and b is the third column of A¹. B. Row reduce the augmented matrix [A I3]. C. Row reduce the augmented matrix [A e3], where e3 is the third column of 13. A OD. Row reduce the augmented matrix where ez is the third row of I3. ез The third column of A¹ is (Type an integer or decimal for each matrix element.)

Consider the matrix A=[2314]. Show that any of the three types of elementary row operations can be used to create a leading 1 at the top of the first column. Which do you prefer and why?

Solve for x,y,z and w in the matrix equation wxyx=-432-1+2ywzx.

Determine the dimension of the matrix 14710238.