18. Which of the following best represents the line of best fit for the data shown in scatter plot?
30
20
10
-10 8 6 4 2 0 2 4
-10
6 8 10 12 14
-20
-30
-40
A. y = -3.2x + 5.1
B. y = -2.4x + 10.3
C. y = -4.7x – 5.3
D. y = -8.2x + 3.4

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