Matlab question! Help please!

(Adapted from Enderle, Blanchard, and Bronzino, Introduction to Biomedical Engineering,Third Edition, p. 215, problem 12). We will be modeling the viscoelastic properties of tissues using the 3-element Kelvin model using the nomenclature from Chapter 4: El Note the two forms of the constitutive equations: one is useful for finding the creep response strain); (constitutive equation written in terms of s put a step change for stress, and solve for and the other is useful for the stress relaxation response: (constitutive equation written in terms of stress: input a step change for strain, and solve for stress)