Solve for parts a, b, and c

1.18. Consider a discrete-time system with input x[n] and output y[n] related by y[n]=k=nn0n+n0x[k], where n0 is a finite positive integer. (a) Is this system linear? (a) Is this system time-invariant? (c) If x[n] is known to be bounded by a finite integer B (i.e., x[n]