I need help with #11 - #14.

Answer:
I can get you jump started a bit.
Step-by-step explanation:
So Each of those pairs of figures are Similar.
This means they have equal angle measures but different side lengths.
To find it, we have to make a Proportion:
Example: #11
[tex]\frac{x+1}{3x+1} =\frac{8}{20}[/tex]
So let's solve the first one!
[tex]24x+8=20x+20\\4x=12\\x=3[/tex]
Easy As Pie!
If you need more help, contact me! :)
Hope this Helps!
P.S. Stay Safe!