A Pentagon can be broken up into 5 equal triangles. Area of the Pentagon is the sum of all the 5 triangles.
Area of the pentagon = 5 ( 1/2 x 6.2 x 9) = 139.5 mm²
Answer: 129.5 mm² (Answer D)
I think it’s a C since it doesn’t have a letter after since the others have the letters after Graph.
Answer: 2,680 bulbs were used in all.
I added all of them up so 1240 + 1350 + 90 which equals 2,680.
If you have any questions let me know, have a great day!

Notice that

which means the series is divergent. So if this is one of those "select all that apply" questions, then both (c) and (j) are the only choices that do.