Fill in the blanks 3,450ml = L

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

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

3x = 729 solve for x plz . it's urgent. will mark