Jill is studying a strange bacterium. When she first looks at the bacteria, there are $1000$ cells in her sample. The next day, there are $2000$ cells. Intrigued, she comes back the next day to find that there are $4000$ cells!  

1. Should the graph of this situation be linear or curved?

   Answer (a):

   Curved.

2. Create a table and graph for this situation. The inputs are the days that have passed after she first began to study the sample, and the outputs are the number of cells of bacteria.

   Hint (b):

   How many cells of bacteria were there to start with? Make a table starting with day $0$. What is the multiplier?

   More Help (b):

   Extend the table and draw a graph.

3. Give a complete description of the graph of this situation as you did in problem 6-4.