CREATE TABLE table_20069 ("Name" TEXT, "Year" FLOAT, "Landfall" TEXT, "NHC Advisory Number" TEXT, "V ( mph ) " FLOAT, "R ( miles ) " FLOAT, "Saffir-Simpson Category" FLOAT, "CHI" TEXT)

What are the miles when the Carvill Hurricane Index (CHI) is equal to 9.9?
SELECT "R(miles)" FROM table_20069 WHERE "CHI" = '9.9'
SELECT "R(miles)" FROM "table_20069" WHERE "CHI" = '9.9'