book Maths Puzzle Numerical Ability

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!

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book Other Question

Find the sum of the first n terms of the given arithmetic series.
a2=-6, a5=-18 (n=8) i apologize ahead of time if this is in the wrong cat.
how do you write an equation for this problem?
the sum of a number and five times the number??
when i see it my mind goes blank
any help would be appreciated