That’s a good question. But I don’t know the answer
Answer:

Step-by-step explanation:
srry if its wrong but I think it's right :)
btw for the first one
p=19.53
Answer:
x=9
Step-by-step explanation:
Similar triangles
8/20 = 6/(x+6)
==> 2/5 = 6/(x+6)
2/5x+12/5=6
2/5x=18/5
x=9
Answer:

Step-by-step explanation:
Our equation is:

First we dritribute
Now we have, 
light terms
and we get 
X+46.9=61.5
-46.9 -46.9
------------------------
x=14.6