What is proportion to find how many points x a student needs to score on a test worth 50 points to get a test score of 40%

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

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