Answer:
A
Step-by-step explanation:
Answer:7
7,because 30-1/2=7
B = {a, b, c, d}
C = {0, a, 2, b}
B ∪ C = {a, b, c, d, 0, 2}
Everything from the set B and everything from the set C give to one set. Duplicated elements are written only once.
is 10 1/2