Answer
(a) improper; greater than or equal to 1
(b) See images.
Work Step by Step
(a) Proper fractions have a numerator that is smaller than the denominator, while improper fractions have a numerator that is greater than or equal to the denominator.
In Exercise 73, the fractions that can be written as whole numbers or mixed fractions are improper fractions, since their value is always greater than or equal to 1 based on the above definition.
(b) See images.