Is 2π a rational or an irrational number

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

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.

Do you mind if you guys me with this question i’m on number 8