% First part of problem num = [0 0 15 25 20];den = [1 10 17 10 16];[R, P, k] = residue(num, den)% Second part of problemD1 = [1 0 1];D2 = [0 1 2];D3 = [0 1 8];den = conv(D1, conv(D2,D3))