The heavy line means the values on this part are in the solution set. . The open circle means that this value ( - 3) is NOT included in the solution set.
So the answer is x > -3.
Step-by-step explanation:

Count how many of the same number, since you have four 8's the exponent will be

same applies for 3
The width is 6cm
And the length is two times + 3 of the width
6 X 2 + 3 = 15
Add all 4 sides for the perimeter 6+6+15+15=42
The the dimensions are a rectangle that is 6cm wide and 15cm tall
Here is the answer for math problem