The length of a rectangle is five times its width. if the area of the rectangle is 320 m2 , find its perimeter. m

A) L = 5 * W
B) L * W = 320

Substituting A) into B)
B) 5 * W * W = 320
5W^2 = 320
W^2 = 64
Width = 8
Length = 40

5\16 x 2\5 = 10/80simplify to 1/80

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.