Which of the following situations cannot be modeled with the equation 2x + y = 0? A. It takes 2 parts of chemical A to neutralize 1 part of chemical B.
B. Tony must pull twice as hard as Ralph just to sit still in a match of tug-o-war.
C. If Sophie earns twice as many points as penalties, she will break even.
D. Tom's Saturday shift was twice as long as his 2 hour Sunday shift.

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