In 2015 they were approximately 31,000 firearm fatalities express this quantity in deaths per hour

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So, we're giving that in 1 year, 31,000 fatalities happened and the question asks for deaths per hour.

So in order to find the answer, we're going to have to see how many hours are in a year. 
1 year = 365 days
365 * 24(hours in a day) = 8,760
Now, we divide the amount of fatalities (33,100) by 8,760 

Then, we get your answer, 3.78 fatalities per hour.