the intensity of light (in foot candles) varies inversely as the square of X, the distance from the light source. the intensity of light 3 feet from the source is 80 foot candles. how far away is the source if the intensity of light is 5 foot candles?​

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.