Could someone explain/answer these? you in advance!

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)