Help plz I really need help plz

Name the most appropriate metric unit for each measurement like the mass of cow

Given abcd ac=38 and ae=3x+4 find the value of 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.