2. The median household income in Iowa in 2013 was $52,229. In 2011 it was $51,193. (a) Name the variables, including units and dependence. (Hint, pick 2011 as the initial year). (b) Assuming household incomes rise at a constant rate, by how much is the household income rising each year? (c) In order to linear model, we need to know the slope and the intercept. Deter- mine the slope and the intercept. Include units. Hint: no computation is needed for this problem. slope = intercept = (d) the linear equation describing the dependence