Ann works 51/2 hours, mary works 61/3 hours, and john works 41/4 hours. how many combined hours have they worked?

a. 151/12
b. 155/12
c. 161/12
d. 165/12

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