Question

Which is equivalent to RootIndex 5 StartRoot 1,215 EndRoot Superscript x?

243x
1,215 Superscript one-fifth x
1,215 Superscript StartFraction 1 Over 5 x EndFraction
243 Superscript StartFraction 1 Over x EndFraction

Answer 1

(⁵√1215)^x = (1215^(1/5))^x = 1215^(x/5).

So the equivalent choice is "1,215 Superscript one-fifth x" (i.e., 1215^(x/5)).