Aballoon is 30 yards above the ground. it starts to float upwards, and the altitude increases at a rate of 5 yards per minute. enter the altitude, in yards, of the balloon after 20 minutes.

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