What is the difference between multiples and listing ratios

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

What is the slope of the line that contains the points (-2,1) and (0,-3)

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