So I was going over some of my Algebra II work and the part that we're going over is COMPLETELY different than the practice problems. We have this question that I didn't even see the directions for how to solve like this:

What are the missing terms of the arithmetic sequence -8, ___, ___, 3

I know that the difference is 11 between the two numbers, but I've tried every way possible to get the correct answer. I don't understand how to do it at all. Help, please?