Answer:
1=21
Step-by-step explanation:
for every one you go up you move over 21
I got 6x+3
The three equations are:
(2x-6) + (3x+1) + (x+8) =perimeter
2x+3x+x/1x=6x
-6+1+8= 3
Answer: Pentagon
Step-by-step explanation:

<span>Explanation for the last step:</span>
Step 1: Put the numbers in numerical order from smallest to largest. Step 2: If there is an odd number of numbers, locate the middle number so that there is an equal number of values to the left and to the right.