The cost C (in dollars) of making a square window with a side length of n feet is represented by C = 3.5_{n2} A window costs $126. What is the length (in feet) of the window?

Guest Mar 14, 2017

#1**+6 **

Best Answer

C = 3.5n^{2}

Plug in what you know.

126 = 3.5n^{2}

Divide both sides by 3.5

126/3.5 = n^{2}

36 = n^{2}

Take the square root of both sides.

√(36) = n

6 feet = n

side length = 6 feet

hectictar
Mar 14, 2017

#2**+5 **

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.

Guest Mar 14, 2017