9. Which of the following relations are functions? Choose all that apply. Assume that each different variable has a different value.
{(a, b),(ba),(C, C),(e, d)}
{(1,4),(c, d).(0,6)
{(6.b).(c, d).(2.c).(4.a)
{(a, b).(5.c).(c, d).(d.)

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