7.78 rounded to the nearest ones

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

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

F(x)=5/6x+3 which of the following is true