The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length? a. 12 inches b. 15 inches c. 21 inches d. 40 inches

6×2=12

42-12=30

b. 15 inches

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

10 b/c 5*2 =10

step-by-step explanation: