Help I need help like as soon as possible I am sorry if this is hard i think it is easy to be honest

Can someone me with these two circle theorem questions asap?

The function show two sisters' savings account and the rate at which they plan to deposit money

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