PLEASE ANSWER a mixture of purple paint contains 12 teaspoons of red paint and 15 teaspoons of blue paint. use a double numberline to show how much red paint you would need to make the same shade of purple if you have already used 25 teaspoons of blue paint

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