1. A=[-23 1; 3-5 4; 25 3], b=[ 1;5:3], c=[-123] a Suppose Ax=b. Find x b. Suppose yA=c. Find y. 2. Consider the transfer function where n(s) H(s): d(s) n(s)=5s3+2s2+13s+9 d(s) s +12s3+45s + 72s+28 a. Find n(-12), n(-10), d(-12) and d(-8). Find H(-12) and H(-8). b. C. Let C(s)= s+3s+4 s + 6s+12 For what values of 's' does C(s)H(s) = 0 ? 3. Plot a graph of the function y=3x+2x3 + x-4 For 'x' values ranging from -10 to 10.