A fossil is found that contains 10% of the amount of carbon- 14 found in a living being. About how old is the fossil?
A) 19,200 years
B) 15,300 years
C) 17,600 years
D) 20,700 years

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