Some please help it urgent

Me answer number 3plz explain how you do it

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges

Millie decided to purchase a $17,000 msrp vehicle at a 4% interest rate for 6 years. the dealership offered her a $2700 cash-back incentive, which she accepted. if she takes all these factors into consideration, what monthly payment amount can she expect? a.$223.73b.$243.25c.$274.61d.$235.51