I need counter example for these statement

[haya]

Homework Statement

[PLAIN]http://hh7.net/Apr1/hh7.net_13016941501.gif

Homework Equations

these statement are false and i need counter example for each one

The Attempt at a Solution

for(ii) i can say that f(x)=x²-4 on [-6,6]

for others i need help

 

[I like Serena]

For (iii), what about f(x) = 0?

[edit]For (iv), what about g(x) = x + 1?[/edit]