An airline offers the same number of tickets for morning and night flights. When the airline analyzed ticket sales, they determined that the ratio of the number of sold tickets to the number of unsold tickets was 3:53:5 on morning flights and 7:17:1 on night flights. If the airline sells 581581 tickets on night flights, how many unsold tickets can the airline expect on morning flights?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap