Sir I am stuck on this question

Question no 1: If you have the following matrices: 12 101 A = 2 1 ; B = 10 12 ;C = [4 6 2] ; D= 8 12 ; E = [19 11] 13 16 6 6 1) Transpose of the matrix (B) 2) prove 3 (A + E) = 3A + 3E 3) determine the dimension (n x p) of the vector (D) 4) (E-B) 5) Prove (A + B)t = At + Bt