# Thread: Predict from an exponential

1. ## Predict from an exponential

firstly i apologize if this is in the wrong section. I have to predict a value of an exponential growth by trial and error how am i supposed to do this? Any help would be appreciated.

2. Originally Posted by nexer
firstly i apologize if this is in the wrong section. I have to predict a value of an exponential growth by trial and error how am i supposed to do this? Any help would be appreciated.

3. I'll elaborate a little bit,
There is an outbreak of swine flu, and the number of cases increases weekly as shown in the following table

Weeks
Number of cases of swine flu
0
32
1
60
2
96
3
200
4
320
5
570
6
1050

Plot the data from this table using Excel and hence predict how many cases there will be at the end of week 9. By trial and error, predict how long it will be before there are 8 million cases of flu.

4. All I can say is "do what you are told". Use Excel to plot the graph. Look at the height of the graph at t= 9 to see what "how many cases there will be at the end of week 9". Look at the graph, increasing the range if necessary, to see what t is when the graph has height 8000000.