PLZ HELP ITS ONLY 4 PROBLEMS

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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.