If a dozen nails weighs 1 pound, how many nails are in 2.5 pounds?

What is r i 4.5+10r=-6.5 with work pls

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

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