Evaluate the expression for the given values my-y when m=2,x=7, and y =5

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In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

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]