Question

-11 12 years ago

Answer 1

-11<x<-7 translates into the interval (-11,-7);
-7<x<infinity translates into (-7,infinity).
Note that x cannot equal -7.

Together these two intervals constitute the union (-11,-7) U (-7,infinity).

Answer 2

\[(-11,-7)U(-7,\infty)\] ?

Answer 3

@mathmale

Answer 4

Yes, that's right. Very nice work!