Two customers went to a post office to buy posicaids and large enkelapes Fast posrcard costs the same amount, and each large envelope costs the same amount
The first customer paid $12 for 14 postcards and 5-large enveldoles
The second customer paid $24.80 for 10 postcards and 15-arge envelopes
What was the cost in dollars of each large envelope?
A $1.42
B $0.35
C $1.15
D $0.63

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