Answer:
14 million bacteria
Step-by-step explanation:
At time=0, the bacteria was introduced.
<em>The first point on the graph, the y-point corresponding to t=0, is the initial amount of bacteria</em>. This point is 14.
Since y-axis is given in millions, 14 corresponds to 14 million.
Hence, 14 million bacteria were present when the antibiotic was first introduced.