Problem: Hoping to break a two-game losing streak, the Broncos traveled to Arrowhead Stadium for a AFC West rivalry rematch against the Kansas City Chiefs. The Broncos trailed in the first quarter, as Chiefs' quarterback Matt Cassel threw a 2-yard touchdown pass to tight end Leonard Pope, in what would be the game's only touchdown. The Broncos responded in the second quarter, with placekicker Matt Prater nailing a 25-yard field goal, but the Chiefs countered, with a 47-yard field goal by placekicker Ryan Succop just before halftime. After a scoreless third quarter, the Broncos cut into the lead with a 41-yard field goal by Prater, but Kansas City's defense prevented anything else from happening. With the loss, not only were the Broncos officially eliminated from postseason contention, but they also exceeded their loss total from their previous two seasons.
Answer this question based on the article: Who kicked the longest field goal, Matt Prater or Ryan Succop?
A: Ryan Succop

Problem: After a series of Mongol invasions of Korea between 1231 and 1281, Goryeo signed a treaty in favor of the Mongols and became a vassal state. Kublai was declared Khagan of the Mongol Empire in 1260 and established his capital at Khanbaliq in 1264. Japan at the time was ruled by the Shikken of the Hojo clan, who had intermarried with and wrested control from Minamoto no Yoriie, shogun of the Kamakura shogunate, after his death in 1203. The inner circle of the Hojo clan had become so preeminent that they no longer consulted the council of the shogunate ), the Imperial Court of Kyoto, or their gokenin vassals, and made their decisions at private meetings in their residences ). The Mongols also made attempts to subjugate the native peoples of Sakhalinthe Ainu, Orok, and Nivkh peoplesfrom 1260 to 1308.
Answer this question based on the article: How many years was the overlap of the Mongol invasions and the Mongol attempts in Sakhalin?
A: 21

Problem: Success in marriage has been associated with higher education and higher age. 81% of college graduates, over 26 years of age, who wed in the 1980s, were still married 20 years later. 65% of college graduates under 26, who married in the 1980s, were still married 20 years later. 49% of high school graduates under 26 years old, who married in the 1980s, were still married 20 years later. 2.9% of adults age 3539 without a college degree divorced in the year 2009, compared with 1.6% with a college education. A population study found that in 2004 and 2008, liberal-voting states have lower rates of divorce than conservative-voting states, possibly because people in liberal states tend to wait longer before getting married. An analysis of this study found it to be misleading due to sampling at an aggregate level. It revealed that when sampling the same data by individuals, Republican-leaning voters are less likely to have a divorce or extramarital affair than Democratic-leaning voters and independents.
Answer this question based on the article: how many years did the study last that started in 2004?
A:
4