The expression 15/4+3/8x factor is

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 is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Solve x+3y=6 and 4x-6y=6 by elimination . show work !