The points on the number line are -6 and 2.
2 - -6 = 4
2 + 6 = 4
A is not the answer.
--6 - 2 = 8
+6 - 2 = 4
B may be the answer.
-6 - 2 = -8
C is not the answer.
-2 - -6 = 4
-2 + 6 = 4
D is not the answer.
The answer is B) The value of -a - 6 is positive.
Let me know if this is the correct answer. :)