Write as a single interval if possible: [-6, $\infty$) $\cup$ (-4, $\infty$)

Question

Quizplus · Accepted Answer

The intervals overlap, but we can combine them into a single interval by taking the intersection of the two intervals, which is the part common to both intervals. 
The intersection of the two intervals is [-6, F1F1F1S1F1F1F10), which means all numbers between -6 and F1F1F1S1F1F1F10) including F1F1F1S1F1F1F10). Therefore, the best choice is C, which represents the intersection of the two intervals.

Write as a Single Interval If Possible: [-6 ∞\infty∞ ) ∪\cup∪ (-4 ∞\infty∞

Write as a Single Interval If Possible: [-6 $\infty$ ) $\cup$ (-4 $\infty$