Please help me solve these six problem with MATLAB, and show me the process, thanks!

5-6. For each of the characteristic equations of feedback control systems given, use MATLAB to determine the range of K so that the system is asymptotically stable. Determine the value of K so that the system is marginally stable and determine the frequency of sustained oscillation, if applicable. (a) s4 + 2583 + 15s2 + 20s + K = 0 (b) s + Ks3 2s2 + K + 1)x + 10 = 0 (c) s3 + (K + 2)2 + 2Ks + 10 = 0 (d) s3 + 20s? + 10K = 0 (e) s4 + Ks3 + 5s+ 10s + 10K = 0 (f) s4 + 12.5s3 +52 +5s + K = 0