2009 dat

Sorry if I am doing the wrong. This is my first time posting something here... I do not understand this question and I was hoping to get some help. #39 If "f" is a function that satisfies f(x+y)=f(x)f(y) for all real numbers "x" and "y". Which of the following must be of f(0)? A. f(0)=1 B...