Which expression is equivalent to startfraction rootindex 7 startroot x squared endroot over rootindex 5 startroot y cubed endroot? assume y not-equals 0. (x superscript two-sevenths baseline) (y superscript negative three-fifths baseline) (x superscript two-sevenths baseline) (y superscript five-thirds baseline) (x superscript two-sevenths baseline) (y superscript three-fifths baseline) (x superscript seven-halves baseline) (y superscript negative five-thirds baseline).