Write the set of points from -4 to -2 but excluding -3 and -2 as a union of intervals

Question

 I got an answer, I thought the question was easy but the site says it was wrong and I can't get past it now

Answer 1

Your interval would be

 

[-4, -3)∪(-3, -2)

 

 

This also called interval notation.  Whenever you see union, ∪, it indicates a restricted value.