20 points two competing internet companies have recently restructured their payment plans. quick net requires a $10 activation fee and charges $55 per month for their basic plan. speedy net requires no activation fee and charges $57 per month for their basic plan. when will the two plans be equal in cost?

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