On the freeway, it is unsafe to drive too slowly or too quickly. The safest driving speeds on the freeway near Allan’s town were
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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.
