A contour map for a function f is shown. Use it to estimate the value of 
. 
Definitions:
Interposition
A visual cue in which an object partially covers another, suggesting depth perception.
Precognition
The purported psychic ability to see or know about events before they happen.
Precognition
The ability or claimed ability to see or know about events before they happen, often regarded as a psychic phenomenon.
Clairvoyance
The alleged skill of obtaining insights about a thing, individual, place, or physical occurrence without using the five common senses, instead relying on extrasensory perception.
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