How do you do this question?

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 property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Identify this conic section. x2 - y2 = 16 o line circle ellipse parabola hyperbola