Let r+ denote the set of positive real numbers. let f : r × r+ → r be given by f(x, y) = x/y.
(a) is f an injective function? prove your answer.
(b) is f a surjective function? again, prove your answer.
(c) is f a bijection? prove your answer

The jones farm has 24 cows that each produce 52 quarts of milk a day. how many quarts are produced each day altogether

The value √10 and √15 are plotted on the number line

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.