3. (a) [15 points] Is the following argument valid or invalid? Justify your answer. Every nonzero real number has a reciprocal. Zero does not have a reciprocal. Therefore, zero is not a nonzero real number. (b) [15 points] Consider the statement, "Somebody is older than everybody." Rewrite this A ley yons x uosled e E,, unojaya u! iuswales