SOLUTION: I can't seem to figure out where to begin, I keep getting incorrect answers. Could someone help please? What are the missing terms of the arithmetic sequence -8,___, ___, 3?

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Question 262650: I can't seem to figure out where to begin, I keep getting incorrect answers. Could someone help please?
What are the missing terms of the arithmetic sequence -8,___, ___, 3?
What is Sn for the arithmetic series with a1 = 3, an = -38, and n = 8?
What is Sn for the arithmetic series with d = -4, an = 27, and n = 9?

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
-8+x+x=3
2x=11
x=5.5
.
Ed