Plz help will name brainiest and 100 points

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

X-intercept=-5 y-intercept=2 the equation of the line is

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