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2015-05-15T20:43:54+08:00

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The domain consists of the pre-images and the range has the images. 
We have the f(3)=-1 since -1 is the image of 3. When we are looking for the function of a number and we are given a diagram of such, we just need to take the value of the number it is pointing to.
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so the answer is?
The answer is there above. f(3)= -1