Rings: . Zn . Zy (with p a prime number) . Z3 X Z4 . M(R) . Z[i] (see page 55 number 12) . Q[x] ( we'll see this ring in Chapter 4) Questions: 1. Is the ring commutative? 2. What is the additive identity? 3. What is the multiplicative identity (if any)? 4. Describe or list the units (if any) 5. Describe or list the zero divisors (if any). 6. Is the ring an integral domain? 7. Is the ring a field