Write the interval of real numbers in interval notation. The set of real numbers less than -6
A) [-6, ∞)
B) (-∞, -6]
C) (-∞, -6)
D) (-6, ∞)

Question

Quizplus · Accepted Answer

The symbol "<" means "less than", so the set of real numbers less than -6 would be all numbers to the left of -6 on the number line. This excludes -6 itself, so the interval is (-∞, -6). The bracket cannot be used at -6 because it is not included in the interval.

Write the Interval of Real Numbers in Interval Notation