NEED ASAP!! solve for x

Write an explicit formula that represents the sequence defined by the following recursive formula:

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

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol