Can someone please help me with d, e, f, and h, h especially?

Problem. Healthcare costs in the United States have been increasing over the years. The following data shows the average cost of healthcare per person for selected years from 1986 to 2008 (data from CMS.gov website") Year (x) 19861990 20032008 1997 (per person) $1947$2843 $4147 $6099 a) Plot the data (let 1986 be year 0) 15 year b) By observation, predict what type of model (linear, quadratic, cubic, or quartic) will best fit the data c) Using your graphing calculator find the R-value for each model (use x-0 for 1986) Linear 34H Quadratica Cubic 9985 Quartic_ Trends- Centers for Medicare and Medicaid Services: https://www.cms.gov/Research and-Reports/NationalHealthExpendData/Downloads/NHE2014.zip d) Based on the R2-values, which function is the best fit? e) Is this function appropriate? Why or why not? f) If another function is a better fit, which function is it? Why would this be a better fit? g) Using your chosen function, when would you predict health care costs will hit $9500 per person per year? S What would each of your functions predict that health care costs would be in 20142 h) Linear Quadratic Cubic Quartic