Ava answered 95/100 questions correctly on the test, and therefore believes to have earned a 95%. Is Ava correct?

The parabola opens: y=√x-4 (principal square root) up down right left

Can someone me and do the problem plz so i can understand it more better

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