The cost of a bus for a field trip was split evenly between the 120 students going. but thee day before the trip, 30 more students decided to go. dividing the cost evenly among all 150 students brought the average cost down $1.20 per person. what is the total cost of the bus?

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