What is the value of the expression below ?

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss

What expression is equivalent to (84+16)

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]