What is the next number in the pattern: 13,61,151,281 ...?

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.

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Abcd is a square. what is the measure of angle bac