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What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Can someone plz me understand how to do these. plz, show work.in exercises 1-4, rewrite the expression in rational exponent form.[tex]\sqrt[4]{625} \sqrt[3]{512} (\sqrt[5]{4} )³ (\sqrt[4]{15} )^{7}\\ (\sqrt[3]{27} )^{2}[/tex]

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.