Altitude above sea level is given in positive values and below sea level is
given in negative values. If Yancey started
at 1,287 meters above sea level and
decreased his altitude by 4,165 meters
before increasing his altitude by 2,039
meters, what was his final altitude?

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