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Really need your help guys - just dont understand what functions are about at all - simple explanations please.
For which of the following functions f(a+b)=f(a)+f(b) for all positive numbers a and b.
a) f(x) = x^2
b) f(x) = x+1
c) f(x) = sqrtx
d) f(x) = 2/x
e) f(x) = -3x
If any of you guys are feeling particularly generous could you help me understand the geometry problem:
http://www.gmatclub.com/phpbb/viewtopic ... 370#179370