book Maths Puzzle Numerical Ability

Find the sum of the first n terms of the given arithmetic series.
a2=-6, a5=-18 (n=8)

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book Other Question

I have this big huge paper due, but to do it.........I need an equation that is harder than a two step. Can you please just makeone up that would be easy for a 8th grader to solve 2(x+3.1)=9.8

PLEASE HELP ME AS SOON AS POSSIBLE I NEED MY HOMEWORK DONE BY 3:15!!!!!!! sorry to rush you!