The perimeter of a rectangle is 40 inches. if the length of the rectangle is 12 inches, which equation could be used to find the width, x?
a. x+2(12)=40
b. 12( x+2)=40
c. x+12 =40
d. 2(x+12) =40

D. 2(x+12) =40

Step-by-step explanation:

The Perimeter of a rectangle is calculated by the formula :

P = 2 ( length + width )

Let the width of the rectangle be x , then the perimeter becomes

40 = 2 ( 12 + x )

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w