Let x[n] be a finite sequence that is nonzero for n [N1, N2], and h(n) be a finite sequence that is nonzero n [N3, N4]. Answer the followings:
a. For fixed n, what is the range of k that makes h(n-k) nonzero?
b. What is the range of n for nonzero y[n]?
c. What is the range of n so that the product x[k]h[n-k] is zero?
d. What is the length of y[n]? (y[n] is the convolution of x[n] and h[n])