PLS I NEED HELP FAST
Which situation involves a change modeled by a positive number but an end result modeled by a negative number?

Leo enters an elevator on the second floor and goes down four floors.

A plane, flying at an altitude of 300 feet, descends 50 feet.

Irene is scuba diving at –30 feet. She swims 10 feet toward the surface to watch a school of fish.

April owes her brother $5. On Friday, she gets $10 for her allowance.

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