Simplify completely 18 s t to the fourth power over 52 s cubed t times 16 s cubed over 9 s squared t. 8 t squared over 13 s 8 t over 13 s squared 4 t squared over 13 s 4 t over 39 s squared

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