Question

One interval is given in interval notion, another in set builder notion. Match the equivalent intervals.
a. (-∞, ∞)

b. [3,∞)

c. (3,∞)

d. (-∞,3)

Answer 1

a. (-∞, ∞) -> (-∞, ∞)
b. [3,∞) -> {x | x ≥ 3}
c. (3,∞) -> (3, ∞)
d. (-∞,3) -> {x | x < 3}