CREATE TABLE table_18284 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What district is incumbent jack hightower from?
SELECT "District" FROM table_18284 WHERE "Incumbent" = 'Jack Hightower'
SELECT "District" FROM "table_18284" WHERE "Incumbent" = 'Jack Hightower'