The anwser is b because sum means add
Answer:
-11
8 = 2x + 30
8 - 30 = -22
-22 ÷ 2 = -11
x = -11
Also if you place 2×(-11) + 30 you get 8
In order to be considered a semi-conductor the material must have insulator and conductor properties, So the answer would be A,
