40+8a=-8(-a-5) How many solutions. Will mark brainlest

Which of the following is the formula for the sequence graphed below

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.

Find the area of an equilateral triangle with a side of 6 inches