book Maths Puzzle Numerical Ability

Let a1, a2, a3,.......an,....be an arithmetic sequence. Find the indicated quatitties. Could someone please help me with this? a1=-11,d=4;a2=?,a3=?a4=?
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This is a very long and complicTED QUESTION WITH MANY PARTS, and we do not know where to begin. Thanks for any and all help.

3) The formula for calculating the amount of mon 7[-2x - 4 - 2(x+1)] = 7x + 3