Answer:
Hey there!
Well first, don't feel bad, since trig is really hard, especially if you are just learning it.
If you've learned about SOH CAH TOA, you will see that TOA is the best identity to use here.
tangent 20=x/10
tangent 20 (10)=x
x=3.64
Let me know if you have any other trig questions, I'm always here to help :)