Graph Shows the Number of Sports Utility Vehicles $f ( t )$

Short Answer

Graph shows the number of sports utility vehicles $f ( t )$ sold in the United States. $f ( t )$ represents sales in year t in thousands of vehicles. Use the graph to estimate the smallest value of $f ( t )$ for $$( 3 \leq t \leq 9 )$$ .
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Please enter your answer as a number without the units.