"3"+"7" will give the output:

Answer 1

Nope!
There is no print statement

Answer 2

Go into Sololearn's Code section, press "+ Add Code", select Python and try it out. It's a quicker way to get the answer, and you will gain better understanding first hand.

Answer 3

37

Answer 4

37
because It is string- str()
I mean:
print ("3" +"7")
same code:
print(str(3)+ str(7)