The formula y = 2.5x + 13 models the percent of U.S. adults who are considered obese by federal guidelines, where x is the number of years after 1985, and y is the percent of obese adults. In this equation, y is already converted from a decimal, so, for example, a 55% obesity rate would correspond to y =55. According to this formula, in what year was the obesity rate 20.9 percent? Answer: In the year Round to the nearest actual year.