Can someone me simplify #30 and #31

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Consider the first four terms of the sequence below. what is the 8th term of this sequence?

Find the axis of symmerty for x y=x squared -4x-8