Find the intersection of the sets. Write the answer in interval notation.
$$( - \infty , - 9 ] \cap ( - 7 , \infty )$$
A) $( - 9 , - 7 )$
B) $[ - 9 , - 7 )$
C) { }
D) $( - 9 , - 7 ]$

Question

Quizplus · Accepted Answer

The intersection of the sets $( - \infty , - 9 ]$ and $( - 7 , \infty )$ is the empty set because there are no numbers that are both less than or equal to -9 and greater than -7.

Find the Intersection of the Sets (−∞,−9]∩(−7,∞)( - \infty , - 9 ] \cap ( - 7 , \infty )(−∞,−9]∩(−7,∞)

Find the Intersection of the Sets $( - \infty , - 9 ] \cap ( - 7 , \infty )$