The dot plot shows the height, in feet, of a group of trees being studied. How many trees are being studied?

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trees
A number line ranging from 8 to 16 with one dot over 8, one dot over 9, two dots over 10, three dots over 11, one dot over 12, four dots over 15, and one dot over 16.

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