What is the percentage of registered voters in which the d-r spread is +10.4%?
CREATE TABLE table_29238 (
    "City" text,
    "Population" real,
    "Registered voters" text,
    "Democratic" text,
    "Republican" text,
    "D\u2013R spread" text,
    "Other" text,
    "No party preference" text
)
SELECT "Registered voters" FROM table_29238 WHERE "D\u2013R spread" = '+10.4%'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the percentage of registered voters in which the d-r spread is +10.4%? ### Input: CREATE TABLE table_29238 (
    "City" text,
    "Population" real,
    "Registered voters" text,
    "Democratic" text,
    "Republican" text,
    "D\u2013R spread" text,
    "Other" text,
    "No party preference" text
) ### Response: SELECT "Registered voters" FROM table_29238 WHERE "D\u2013R spread" = '+10.4%'