question: According to the Federal Bureau of Investigations 2015 Uniform Crime Report, Indianapolis ranks as the 16th most dangerous city in the U.S., with 17.1 homicides per 100,000 people, compared with the U.S. rate of 4.9 homicides per 100,000 people. Between 2012 and 2014, the murder rate rose by 44%. There were 138 homicides in 2014, with 60% of victims and 90% of perpetrators being young black men. With 144 criminal homicides, 2015 surpassed 1998 as the year with the most murder investigations in the city. With 154 criminal homicides, 2017 marked the third consecutive year of record violence. FBI data showed a 7 percent increase in violent crimes committed in Indianapolis, outpacing the rest of the state and country. Law enforcement has blamed increased violence on a combination of root causes, including poverty, substance abuse, mental illness, and availability of firearms.
Answer this question: How many years saw more than 140 homicides?
answer: 2

question: As of the 2010 United States Census, there were 37,762 people, 14,005 households, and 9,760 families residing in the county. The population density was . There were 15,311 housing units at an average density of . The racial makeup of the county was 93.4% white, 3.5% black or African American, 0.4% Asian, 0.2% American Indian, 1.2% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 2.8% of the population. In terms of ancestry, 54.8% were Germans, 9.8% were Irish people, 5.8% were English people, and 5.6% were Americans.
Answer this question: How many percent of people were not white?
answer: 6.6

question: The iron concentration in the Lackawanna River near Coxton Road ranged from less than 1.21 to 10.5 milligrams per liter, with an average of 3.98 milligrams per liter. The amount of manganese ranged from less than 0.199 to 1.35 milligrams per liter, with an average of 0.67 milligrams per liter. The aluminum concentration ranged from less than 0.5 to 0.664 milligrams per liter. The pH ranged between 6.5 and 6.7, with an average of 6.58. The acidity concentration was typically 0, but once reached 15.4 milligrams per liter. The alkalinity concentration ranged from 24 to 68 milligrams per liter (with an average of 44.37 milligrams per liter). The sulfate concentration ranged from 30.2 to 221 milligrams per liter, with an average of 104.78 milligrams per liter.
Answer this question: How many milligrams difference is there in the high and low iron concentration in the Lackawanna River?
answer:
9.29