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$f left parenthesis x right parenthesis equals 4,000 left parenthesis 0.75 right parenthesis Superscript x$

An entomologist recommended a program to reduce a certain invasive beetle population in an area. The given function estimates this beetle species' population $x$ years after $2012$ , where $x less than or equals 7$ . Which of the following is the best interpretation of $4,000$ in this context?