Hello!
You can break the inequality up into 2
1 < = n + 4 and n + 4 <= 8
You can solve the two inequalities
1 < = n + 4
Subtract 4 from both sides
-3 <= n
n + 4 <= 8
Subtract 4 from both sides
n <= 4
We are looking for a number line that is -3<= n <= 4
The number line needs to have the dots on -3 and 4 with the dots shaded in
The only line that follows this is choice A
The answer is A
Hope this helps!