Olympia ate lunch at a restaurant. the amount of her check was $6.89. she left $8.00 on the table, which included the amount she owed plus a tip for the waiter. which equation shows t, the amount of her tip, in dollars? a.6.89 + t = 8.00 b.6.89 - t = 8.00 c.6.89t = 8.00 d.6.89 = 8.00 ÷ t