This is a TI-84 activity that uses data from the United States debt over time. It can easily be done with other technologies.
You can get the student sheet here: US Debt Student Activity and the teacher notes and solutions here: US Debt Activity Teacher Notes.  You can get the TI-84 data here: US_Debt. Or you can get all 3 files in a zip folder: US Debt Activity ALL Files .

Here is the student pdf:

s01

s02

Here is the teacher notes and solutions pdf:

t01

t02

t03

 

t04

t05

t06

t07

See the link to the US Debt Clock  above. Enjoy …