Military Personnel on Active Duty The number of military personnel on acti...

Military Personnel on Active Duty The number of military personnel on active duty in the United States during the period from 1965 through 2010 is approximated by the cubic model

where x = 0 corresponds to 1965 and y is in millions. Based on this model, about how many military personnel were on active duty in 2010? (Source: U.S. Department of Defense.)