Problem #1: Enter the following 3 matrices into Matlab, -3 0 10 2 31 38 1 -24 A = -28 -27 -37 -50 38 36 -25 37 B= -49 33 -47 -43 28 44 -49 -41 -6 -36 16 -17 -40 -28 43 2 -40 C=-50 -1 -49 -30 To check that you have correctly entered these matrices into Matlab, verify that ATCB = 1967 55940 -176717 18634 -7100 -8208 207616 11652 3569 68220 -246724 20253 8058 -37992 -130554 -32496 and that tr (ATCB) = -285461. = = (a) Let D= CBAT. Find d44 (i.e., find the entry in row 4, column 4 of the matrix D) (b) Let E = ABCT. Find tr (E) (c) Let F be the reduced row echelon form A+CB. Find f14. (i.e., find the entry in row 1, column 4, of the reduced row echelon form of ATCB)