E and F are real numbeds

Question

E and F are sets of real numbers defined as follows
E ={ w | w Less than or equal to 4}
F = { w | w < 7 }
Write E ∪ F and E n F using interval notation.
If the set is empty, write ∅

Answer 1

E∪F = (-INFINITY, 7)

 

E∩F = (-infinity,4]