Martin can run 1 mile in 7 minutes. What valid proportions can be written from this information? Check all that apply. StartFrac
tion 1 over 7 EndFraction = StartFraction 3 over 21 EndFraction StartFraction 1 over 21 EndFraction = StartFraction 3 over 7 EndFraction StartFraction 7 over 1 EndFraction = StartFraction 3 over 21 EndFraction StartFraction 7 over 1 EndFraction = StartFraction 21 over 3 EndFraction StartFraction 1 over 7 EndFraction = StartFraction 21 over 3 EndFraction
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which is undefined when