done on matlab :

Task 04: Write a function that accepts a sequence[n], the discrete time n and a number no, a, b as input arguments, and returns the signals [n-no]1.l-n].^an]and [bn]. Where a[an]represents the time compressed version of [n] and [bn]is the time expanded version of [n] .

proper syntax and comments also screen shot of code of matlab and the screen shot of plot signal