interval and list notation problem - pre-calculus

[starlet1]

Let A=(-2,3] and B=(2,INF). Find:

a.) AUB


b.)A(UPSIDE DOWN "U")B


c.)A\B


d.)B\A

I thought a was (-2,3] and b was (-1,2) and c was (-1,1) and d was (2, INF) but i think some are wrongly written or are missing symbols like U

i know U means union but im still not sure what symbols mean and how to go about even answering the problem. Thanks.

 

[lookagain]

Let A=(-2,3] and B=(2,INF). Find:

a.) AUB

> > Include all of the members from both sets. < <

\(\displaystyle \text{Potentially, you are looking for it to be (-2, INF), but are
there gaps?}\)


b.)A(UPSIDE DOWN "U")B

> > Intersection. It is the set that includes only the common
elements from both sets. < <


c.)A\B \(\displaystyle \text{A not B. Remove elements from set A that are also
elements of set B.}\)


d.)B\A\(\displaystyle \text{B not A. Remove elements from set B that are also
elements of set A.}\)

I thought a was (-2,3] and b was (-1,2) and c was (-1,1) and d was (2, INF) but i think some are wrongly written or are missing symbols like U

i know U means union but im still not sure what symbols mean and how to go about even answering the problem. Thanks.

Please explain your reasonings for your answers so they can be addressed.