Y : x
14 : 18
31 : x
18*31/14=x
39.85714286
ANSWER
x=39.86
A + b = d+c
<span>a - b = e - c </span>
The b and c cancel out.
<span>2a = d+e </span>
<span>a = (d+e)/2 </span>
Answer:

Step-by-step explanation:
Look at the picture.

CF=EC=DC
2CF=CD
CD = 20 in.