how much square tile does she need to purchase

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

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?

The product of (7x-2) and (20-3x)/4. when x=4