Suppose a scientist has 13 liters of acid and she needs 16 liters for an experiment.
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2. The graph moves up 4 units. (See the blue line in the graph below.)
The domain is unchanged. (The function is still defined for all x.)
The range went from [0, ∞) to [4, ∞), since 4 was added to the minimum value.
Keeping in mind that, there are 12 months in a year, therefore, 7 months is really just 7/12 of a year.
