Duncan has three test results with a mean of 25 and a range of 20. His first result was 21. What did he get on the other two tests? Prini has 5 cards. The 5 cards have a mean of 11 and a range of 8. What are the numbers on the last two cards?

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