user: Question: What is the total number of First elected that has a country represented in baltimore county, a district of 06.0 6, and a committee of economic matters?
Columns: ['District', 'Counties Represented', 'Party', 'First Elected', 'Committee']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['05.2 5B', 'Carroll, Baltimore County', 'Republican', 1974.0, 'Health and Government Operations']
SQL:

assistant: SELECT COUNT("First Elected") FROM "Table" WHERE "Counties Represented" = 'baltimore county' AND "District" = '06.0 6' AND "Committee" = 'economic matters';