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Which is equivalent toStartRoot 10 EndRoot Superscript three-fourths x ?

RootIndex 3 StartRoot 10 EndRoot Superscript 4 x
RootIndex 4 StartRoot 10 EndRoot Superscript 3 x
RootIndex 5 StartRoot 10 EndRoot Superscript 4 x
RootIndex 8 StartRoot 10 EndRoot Superscript 3 x