12x • 12x • 12x • 12x • 12x
x + 7
6x + 9
x + 10
write an equation to find the value of x so that each pair of polygons has the same perimeter

answer:

x=4.25 or x=4 1/4

step-by-step explanation:

12x(5) is 60 so 8x+26 has to equal 60 so you subtract 26 from both sides to get 8x=34 so x=4.25 or 4 1/4

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.