Answer:
4b+8 = 20
---------------
4b = 20
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b = 5
Step-by-step explanation:
We need to solve for b in the following equation:

When we multiply each term by 2 the denominator cancels out:

Next, we subtract 8:

Final step, we isolate the variable. We cancel the multiplication on the left side when dividing by 4 on each term

Answer:
I believe it's the 1st one.
HOPE IT HELPS! BE SAFE :3
5. 4 rows of circles with 4 columns of circles
6. A Hexagon with 4 circles