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` C`

/|\

/ | \ 10

17 / | \

/ | \

/ | \

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A x D y B

*In triangle ABC, if AC = 17 cm, CB = 10 cm, AD = x cm, DB = y cm, and AB = 21 cm, find the value of x - y.*

I have no idea how to get started on this one. It's the last one in the assignment, but it doesn't have a "*" by it, so it shouldn't be this hard!