The length of a rectangle is 2x - 1cm. The width is 6cm.
Write an expression for the perimeter of the rectangle. Simplify the
expression.

4x+10 cm

Step-by-step explanation:

length of rectangle= 2x-1cm

breadth of rectangle= 6 cm

perimeter of rectangle= 2(L+B)

                                    = 2( 2x-1+6)                                 (substituting the values)

                                    =2(2x+5)

                                    =4x+10

Therefore, the perimeter of the rectangle is 4x+10 cm.

Hope it will help you...

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.