Product a is an 8-oz. bottle of cough medication that sells for $1.36. product b is a 16-oz bottle of cough medication that costs $3.20. which product has the lower unit price?

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]