I am not too sure if I did this question correct. Thanks in advanced!

Data table:
Time after Consumption (min): 30 60 90 120 150 180
Amount of Codeine in Blood (mg): 27.0 23.5 21.2 18.7 16.6 14.5

1.) create a scatter plot of the data and determine a suitable equation to model the amount of codeine in the bloodstream t min after taking the pill. Justify your choice of models.

This is what I did: I labelled the x-axis as Time (min) and the y-axis as Amount of Codeine (mg) and then I plotted each of the points.
After that I used the formula A=Pe^kt and got the equation A=31.0213e^-0.00463t. Would this equation be correct? Also, what does the question mean by "Justify your choice of models"

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