The Nearsighted Cow Problem: A Calculus Classic.
A rectangular billboard 5 feet in height stands in a field so that its bottom is 9 feet above the ground. A nearsighted cow with eye level at 4 feet above the ground stands feet from the billboard. Express , the vertical angle subtended by the billboard at her eye, in terms of . Then find the distance the cow must stand from the billboard to maximize .

Question

The Nearsighted Cow Problem: A Calculus Classic.
A rectangular billboard 5 feet in height stands in a field so that its bottom is 9 feet above the ground. A nearsighted cow with eye level at 4 feet above the ground stands  feet from the billboard. Express , the vertical angle subtended by the billboard at her eye, in terms of . Then find the distance  the cow must stand from the billboard to maximize .

alekos · Answer

you're missing a few things in the question

"cow stands ? feet from the billboard"
"in terms of ?"
maximize what?