Heelp :(

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

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