user: Question: How many different teams had an average start of 12.9?
Columns: ['Year', 'Starts', 'Wins', 'Top 5', 'Top 10', 'Poles', 'Avg. Start', 'Avg. Finish', 'Winnings', 'Position', 'Team(s)']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1986.0, 4.0, 0.0, 0.0, 1.0, 0.0, '17.0', '19.5', '$5,390', '47th', '#03/#07 LaJoie Racing']
SQL:

assistant: SELECT COUNT("Team(s)") FROM "Table" WHERE "Avg. Start" = '12.9';