MATLAB: How can i solve this problem give me a useful answer ASAP

Question

x[n]=-0.75u[n]

h[n]=a.^n.*u[-n-2]

-15<=n<=15 ; a=0.15.

Answer 1

Here's a start:

   n = -15:15;
   x = zeros(size(n));
   x(n>=0) = 0.75;
   figure;
   stem(n,x);
   a = 0.15;
   h = zeros(size(n));
   h(...) = ...
   figure;
   stem(n,h);