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3?

yes, so your shadow is 4 times as big as you. so the scale factor between you and your shadow is 1:3

1:3 means " one is to three". so if one is to three, then 10 is to ?

so for the first part of the problem it would be 1:2 and the second it would be 2:1?

no no. If you are 0.2 feet tall and your shadow is 4 feet tall, what is the scale factor?

4/.2 = 20?

yes. so the scale factor between the projected image and the actual flea size is 20:1

note that if you say the scale factor of the flea size to the projected image, it would be 1:20

20x10?

so if the flea actually jumps 10 cm, yes, it jumps 20X10 = 200 cm on the screen.

good job.

how would you explain your reasoning?

I just did in detail.

http://www.purplemath.com/modules/distform.htm