How many whole numbers from 1-1000 do not contain the digit 1? Help me ASAP!

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

What is 10+10+20 about the origin the square root of a triangle.

Similarly fie each expression 18,19,20