Answer:
Option A is correct that is 
Step-by-step explanation:
We have been given a formula 

We will put values of n in
when n=2 we get
when n=3
Therefore, Option A is correct that is 
Answer:
No, they aren't similar.
Step-by-step explanation:
<u><em>Let's take the proportionality of their sides to check whether they are similar or not:</em></u>

=> 2 ≠ 3
So, they are not similar.
Answer:
Step-by-step explanation:
the first one cant be a triangle
im pretty sure the second one can
the third one can
im pretty sure the fourth one cant
9=m-4
9+4=m
13=m
9=13-4
9=9
I hope this answer helped you!!! Thank you!!!
basically your just combining like terms then multiplying to get
-2p^5+5q