In the given table, the values of \( f(x) \) represent the number of butterflies in Kyle's collection at different points in time, where \( x \) represents the number of years.
At \( x = 0 \), \( f(0) = 5 \). This indicates that Kyle started his butterfly collection with 5 butterflies.
Therefore, the 5 represents the number of butterflies Kyle started with.