Mathematics
help?................................................................please

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point D is between rs so we have a line that is r-> s the length of rs 

think of this as a number scale

so RD is 7

which runs from 1-7

then DS=12 so from D to s is 12

point d is between r and s

so it goes

r d s

r to d is 7 then d to s is 12 so add them up to get 19

Please let me know if you need any clarification. I'm always happy to answer your questions.

Jordan B. (82)
UIUC

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