TA Comments: The original version of solutions for question 3 were erroneous.
The graph for x[n-k] should be 0 at n, and 1's from n+1 to n+10
The correct solution (as Kim described) is as follows:
y[n]=0 for n<-10
y[n]=n+11 for -10<=n<=-1
y[n]=9-n for 0<=n<=8
y[n]=0 for n>8
