Given that the values in the table represent the graph of a continuous function, y has at least how many zeros?
x y –3.0 8.40 –2.4 0.69 –1.8 –0.39 –1.2 0.24 –0.6 0.46 0 0 0.6 –0.46 1.2 –0.24 1.8 0.39 2.4 –0.69 3.0 –8.40