Step-by-step explanation:
hope you can send the questions again because your question is to long to answer everything. I answered 1,2,3,4
Answer:
396°
Step-by-step explanation:
Difference = 357 -(-39) = 357+38 = 396°
Answer:

Step-by-step explanation:
We need to find union of given sets
and 
We know by definition that union of two given sets say A and B is set C with all the unique and common values given in set A and B.
∴
∪
= 