The width of a rectangle is 6 km less than twice its length if the area is 140 square kilometers find the dimensions of the rectangle

L = 10 , W = 14

Step-by-step explanation:

Let represent the Length and represents the Width , then from the first statement , we have

That is :

The formula for finding the area of a rectangle is given as:

x Width

That is :

140 =

That is :

solving the quadratic equation , we have

or

Since the length can not be negative , therefore :

L = 10

Substitute L = 10 , to get W ,

W = 2L - 6

W = 20 - 6

W = 14

Therefore , the dimension is 10 x 14

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.