A sonar operator on a battleship detects a submarine at a distance of 500 m(horizontally) and at an angle of depression of 37º. How deep is the sub?*

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

How many and of which kind of roots does the equation f(x)=x3−x2−x+1

Which method of gathering data will be most effective in learning how diet and fitness choices affect long-term healt