What am I doing wrong on #3? what is correct? also how do i solve #5

"A Homework 6. - MA 121, section ( X Course Hero X webassign.net/web/Student/Assignment-Responses/last?dep=24330732 3. [-/3 Points] DETAILS MY NOTES Rancher Joan wants to build a three-sided rectangular fence near a river, using 160 yards of fencing. Assume that the river runs straight and that Joan need not fence in the side next to the river. Joan wants to build a fence so that the enclosed area is maximized. . What should be the length of each side running perpendicular to the river? 40 |yards . What should be the length of the side running parallel to the river? 30 yards . What is the largest total area that can be enclosed? square yards Submit Answer Viewing Saved Work Revert to Last Response 4. [2/2 Points] DETAILS PREVIOUS ANSWERS MY NOTES Find the absolute maximum and minimum values on the closed interval [-3,3] for the function below. If a maximum or minimum value does not exist, enter NONE. f(x) = (4x)/(x2 + 1) -2 (absolute max) (absolute min) 5. [-/2 Points] DETAILS MY NOTES When a carnival owner charges $3.00 for admission, there is an average attendance of 100 people. For every $0.10 increase in the admission price, there is a loss of 2 customers from the average number. a. What admission price should be charged in order to maximize revenue $ b. What is the maximum revenue? Type here to search O W 199 E 7:36 PM 11/17/2020