1. Multiplexers are digital switches that select one of several inputs to be output. In the lecture, a stereo receiver was used as an example of multiplexing. What are some other everyday, practical examples of multiplexing? You can reference either specific examples or devices, such as the stereo receiver, that perform this function.

2. Research and determine how the data from a computer keyboard is translated into the binary code required for input to a computer. Remember to cite your sources. Can we use decoders for this function?

3. How would you determine the stability of a discrete time system difference equation without using z-transforms?

4. We know that system stability is determined by the position of poles in either the s- or z-domains. What is the role of zeros in determining system behavior? Please cite all sources.