Lines A, B, and C show proportional relationships. which line has a constant of proportionality between y and x of 1/2

What situation is an example of an observational study

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.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?