Calculus

poster is to contain 80 square inches of print. The top an bottom margins are 4 inches each, poster? and the left and right margins are 2 inches each. What dimensions minim ions minimize the area of the 10. A rectangular piece of land has an area of 200 square feet, and is enclosed by fencing on 3 sides. (The fourth side is along a river). What dimensions minimize the amount of fence needed