Question: Tables 14.4(a) and (b) make (R, +, ) into a ring, where R = {s, t, x, y}. (a) What is the zero for this

Tables 14.4(a) and (b) make (R, +, •) into a ring, where R = {s, t, x, y}.
(a) What is the zero for this ring?
(b) What is the additive inverse of each element?
(c) What is t(s + xy)?
(d) Is R a commutative ring?
(e) Does R have a unity?
(f) Find a pair of zero divisors.

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