Needs the answer! I do not understand

What situation is an example of an observational study

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

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