What is pollution, and what can we do about it?

Which one of the following is not a good procedure to follow if you wish to avoid being rear ended by another vehicle

Hurry: the angle measures associated with which set of ordered pairs share the same reference angle? (-square-root 3/2, 1/2) , (-1/2, -square-root 3/2) (1/2, -square-root 3/2) , (-square-root 3/2, 1/2) (-1/2, -square-root 3/2), (1/2, square-root 3/2) (square-root 3/2, 1/2) , (1/2, square-root 3/2)

While aphorisms and epigrams both express a truth about life, an epigram usually has a a. humorous tone b. serious tone c. grave tone d. eclectic tone