
Steve S. answered 03/31/14
Tutor
5
(3)
Tutoring in Precalculus, Trig, and Differential Calculus
There are 50 apple trees in an orchard, and each tree produces an average of 200 apples each year. For each additional tree planted within the orchard, the average number of apples produces drop by 5. What is the optimal number of trees to plant in the orchard?
x y
50 200
51 195
y - 200 = ((195-200)/(51-50))(x-50)
y - 200 = (–5/1)(x-50)
y = –5x + 450
yield z = xy = x(–5x + 450)
z = –5x(x – 90)
zeros: x = 0, x = 90
Axis of Symmetry: x = (90 – 0)/2 = 45
Vertex is at maximum yield and has x = 45 trees.
The optimal number of trees to plant is 45.
x y
50 200
51 195
y - 200 = ((195-200)/(51-50))(x-50)
y - 200 = (–5/1)(x-50)
y = –5x + 450
yield z = xy = x(–5x + 450)
z = –5x(x – 90)
zeros: x = 0, x = 90
Axis of Symmetry: x = (90 – 0)/2 = 45
Vertex is at maximum yield and has x = 45 trees.
The optimal number of trees to plant is 45.