Help me i dont understand

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

This question awards 100 ! i really don’t want to fail i will also mark you !

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.