The cost C (in dollars) of making a square window with a side length of n feet is represented by C = 3.5n2 A window costs $126. What is the length (in feet) of the window?
C = 3.5n2
Plug in what you know.
126 = 3.5n2
Divide both sides by 3.5
126/3.5 = n2
36 = n2
Take the square root of both sides.
√(36) = n
6 feet = n
side length = 6 feet
A square window would have 4 equal sides
so 126 / 4 =31.5
Meaning each side othe square window would cost $31.50.
Then I see that it is a trick quetion as that has nothing to do with the question at all.
So to the equation C= 3.5 n^2
C=126
126 = 3.5 n^2
dived both sides by 3.5
126 / 3.5 = 36 3.5(n^2) / 3.5 = (n^2)
36 = n^2
Take the square root of both sides
(6*6) = 36 (n*n)=(n^2)
6=n
n=6
Length of each side is 6 feet.