Married Couples with Children The percentage of families that were married couples with children between 1970 and 2010 is approximately P(t) = 46.3 10.27 (1 s ts 5) where t is measured in decades, with t = 1 corresponding to 1970. (a) What percentage of families were married couples with children in 1970? In 1990? In 2010? (Round your answers to one decimal place.) in 1970 X % in 1990 X % in 2010 X % (b) How fast was the percentage of families that were married couples with children decreasing in 1980? In 2000? (Round your answers to one decimal place.) in 1980 X % per decade in 2000 X % per decade Need Help? Read It