1. The problem statement, all variables and given/known data 2. Relevant equations BIBO stability requires, for every input, that the system output y(n) is: |y(n)| ≤ By < ∞ Linear time invariant systems are BIBO stable when: Summation from -∞ to ∞ |h(n)| ≤ Bn < ∞ 3. The attempt at a solution For part a, I got the system was unstable. As n increase the input grows exponentially by a factor of 2. So that means depending on my input x(n) can never be bounded. Part b, I also got unstable, since the inputs are not bounded. And it may grow exponentially or decrease exponentially depending on x(n). Part C, it's periodic so it's always unstable Part D, I got BIBO unstable since the inputs are not bounded. It's the summation from negative infinity to n. Can anyone help verify my answers? Thank in advance!