BD=16 and CE=12. Find AE

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.