Step-by-step explanation:
C=y[20]
Cy=[20] Answer is Cy=[20]
You should choose c because it makes the most sense out of all of them
X * 3 = 270
Solving for x, x = 90
So one side is 90m and the other is 3m.
Now find entire perimeter 90+90+3+3=180+6=186m
Simple...
you have:

Dividing-->>
0.23076923
But, remember, you're rounding to the nearest hundreth...
0.23Thus, your answer.