Find the perimeter of the triangle.

all the sides of the triangle are the same because this is equilateral. this means:

(21 - x) = (2x - 3) = (x + 5)

Let's take (x+5) and (2x - 3)

x + 5 = 2x - 3   subtract x from both sides

    5 = x -3   add 3 to both sides

          8 = x   you can rearrange this to x=8

Now it's the fun part! SUBSTITUTION! :D (sarcasm)

               BUT WAIT Remember, all of the sides are equal to one another! That means we only have to solve for one side!

Let's do the top side.     21 - 8 = 13

Since there are 3 sides in a triangle, we can easily multiply the 13 by 3

13 x 3 = 39     The perimeter is 39 inches

-14 is the answer

hope this : ))

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.