Ned Help Plz

x = 45

x = 19

Step-by-step explanation:

A straight line = 180°

So,

12.

3x + x = 180

4x = 180

4      4

x = 45

13.

(5x + 4) + (x - 2) + (3x + 7) = 180

Combine like terms:

(5x + 4) + (x - 2) + (3x + 7) = 180

9x + 4 - 2 + 7 = 180

9x + 9 = 180

      -9     -9

   9x = 171

    9       9

     x = 19

Hope this helped.

10) x = 45

11) x = 171 / 9

Step-by-step explanation:

10) 3x + x = 180 , x = 45

11) (5x+4) + (x-2) + (3x+7) = 180 , 9x + 9 = 180

9x = 171 , x = 171 / 9

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

answer: i think you should do the math and pay attention in class : )

step-by-step explanation:

that is truly what   think but if i get the answer i will