Eight of us go fourth, not back, to protect our king from an attack. What are we?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

My location can be determined by the below rebus.
So where am i ?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Which part of London exists in France as well ?

What is the next number in this series?

4,12,84,3612....

What does this rebus mean?

O
N
C
E
TIME

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

I know a nine-letter word having only one vowel.
Do you ?