How many yards shorter was Nick Folk's field goal compared to Aaron Pettrey's field goal?
return Nick Folk ;return field goal  of #1 ;return yards of #2 ;return Aaron Pettrey ;return field goal  of #4 ;return yards of #5 ;return difference of #6 and  #3
['select', 'project', 'project', 'select', 'project', 'project', 'arithmetic']