Question

13+(3n) when n is 4.n=4

Answer 1

Whoops, didn't read that right. It is 25. Thought it was 4*n=4.

Answer 2

Plug 4 in for n:
13+(3(4))
13+3(4)      (Follow PEMDAS and multiply the 3 &4 first)
13+12        
=25