A) goats that weigh exactly 50 or 60 pounds fall into two classes.
b) a function may be formed using weights of goats as the x-value and weight range as the y-value.
c) goats weighing between 40 and 73 pounds fall into only one weight class.
d) a function may be formed using weight range as the x-value and the weight of a goat as the y-value.