I need help with college algebra

Question

simplify the following union/intersection

 

(2.2,3.7) Intersection sign (all intergers)

 

Answer 1

{2.2, 3.7}∩{all integers} = ∅  (null set)

 

Neither 2.2 nor 3.7 is a member of the set of all integers.  Hence the intersection is empty.