CREATE TABLE table_729 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What district is F. Edward Hebert the incumbent in?
SELECT "District" FROM table_729 WHERE "Incumbent" = 'F. Edward Hebert'
SELECT "District" FROM "table_729" WHERE "Incumbent" = 'F. Edward Hebert'