Extended-response test anwer key. 1. a surveyor is surveying a conservation area. a. a rectangular wetland conservation area is 5.25 miles by 4.8 miles. estimate the area of the park. use a = ℓw. explain each step. b. explain how to multiply decimals. use the dimensions in part a to find the area of the conservation area. c. explain how to divide decimals. then divide to find the length of a rectangular lot that is 1.6 miles wide and has an area of 2.8 square miles.