Mrs. Smith donated $20
The constant proportionality is $1 because no matter what, Mrs. smith will donate $1 for each mile. So if Sam were to only walk 1 mile, mrs. smith would donate $1. Or seen as a 1:1 proportion.
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Therefore, should be your final answer.
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for the first one it is 112. For the second it is 150.
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Hope I helped :)
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8 i think
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