Please help me!!

Solve both problems using elimination!!

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

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.