Which statement describes an elastic collision?

Standard deviation of 19,29,21,22,23

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

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