A high five A high five
Yes, there is a pension paid to ex-presidents.
the vice president takes over
If the president resigns or is killed while in term, the vice president takes over his job.
all of them
Absolutely.
The Vice President becomes President and completes the original Presidents original term of office.
George W Bush and Barack Obama
Nine presidents had their terms finished by the vice-president, Eight of these died in office-( four from assassination and four from natural cause ) and one resigned before his term was over.
It cannot change during a president's term.
I believe it's around 9 presidents.
US presidents have a 4-year term.
Four years.