Answer:
1.846=x
Explanation:
SO to find X
We know perimeter is 16
So we have all the sides so add them all up
3x+3+8x-5+2(x-3)=16
Now distribute the possible things first 
3x+3+8x-5+2x-6=16
Now combine like terms 
13x-8=16
add 8 on both sides 
13x=24
Since the problem asked for rounded to 3 decimal places 
1.846