Find and graph data for the U.S. debt every other year, from 1987 through 2017. This information can be found online. Do you think a linear model or an exponential model would be more appropriate for this data? Remember, Linear functions have a constant rate of change. Explain your reasoning (what is the debt doing every two years? How much of change are you seeing?) and then find the appropriate model. Example: f (t) = ? * (?) t/2 ; where t is the number of years after 1987 and in denominator is the the data is for every 2 years. What does your model predict for the future? Do you think it will be accurate? Explain your reasoning