Matlab question

Signal implementation with MATLAB Construct a DT signal given by Tak x[k] = (1 - e-0.003%) cos 20 for 0 Sk s 120. I Sketch the signal using the stem function. II. transform the signal x[k] based on the operation y[k] = x[k/5) followed by the operation 2k] = y15k]. III. What is the relationship between x[k] and [k]? IV. (iii) Repeat (ii) with the order of interpolation and decimation reversed