Randolph has $20,000. He invests his money and expects to earn 9% on the
investment. Approximately how many years will it take for his investment to become
$80,000? Use the rule of 72 to figure this out.

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