QuestionCombine the intervals $(-\infty, 9)$ and $(-\infty, 12)$ into one interval. What is the result in interval notation?

Studdy Solution
Since the interval $(-\infty,12)$ contains all the points in the interval $(-\infty,9)$ and more, the union of these two intervals is simply $(-\infty,12)$.
$$(-\infty,9) \cup(-\infty,12) = (-\infty,12)$$So, the single interval that represents $(-\infty,9) \cup(-\infty,12)$ is $(-\infty,12)$.