Farmer ed has 7000 meters of fencing and wants to enclose a rectangular plot that borders on a river. if farmer ed does not fence the side along the river, what is the largest are that can be enclosed? width = 2x length = 7,000-2x

Icould really use some with this question.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coup?