Igive a medal if you can figure this out fast! a certain forest covers an area of 4200 km2 . suppose that each year this area decreases by 8.5% . what will the area be after 8 years?

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?