P=2l+2w
120=2(2w)+(2w
120=4w+2w
120=6w
w=20
120=2(20)+2(l)
120=40+2l
80=2l
l=40
Length is 40 and width is 20 feet
hope this helps:)
Answer:
C(x) = 8*x + 8* (1000)/x + 80
C(x) Domain x > 0
Step-by-step explanation:
enclosed area 1000 ft²
let x be side perpendicular to the river
and y parallel to the river
Then:
A = x*y y = A / x y = 1000/x
Cost of one side (x) 4*x $ then two sides cost = 4*2*x cost = 8*x
Cost of one side (y) 8*y $ 8* (1000/x)
Cost of four cornes posts 4*20 = 80 $
Total cost C(x)
C(x) = 8*x + 8* (1000)/x + 80
R { x > 0}
Taking derivatives both sides of the equation
C´(x) = 8 - 8000/x² C´(x) = 0 8 - 8000/x² = 0
8x² -8000 = 0 x² = 1000
x = 100
<em>WHAT</em><em> </em><em>DO</em><em> </em><em>U</em><em> </em><em>Mea</em><em>n</em><em>?</em><em>?</em><em>?</em>
<em>Dont</em><em> </em><em>waste</em><em> </em><em>your</em><em> </em><em>points</em><em> </em><em>in</em><em> </em><em>such</em><em> </em><em>unnecessar</em><em>y</em><em> </em><em>things</em><em>.</em>
<h2>
<em>hope</em><em> </em><em>u</em><em> </em><em>understand</em><em>.</em><em>.</em><em>.</em></h2>
Refer to attachment for your answer
In ancient times it took 2 years