Lisa finished her history assignment in 7/8 hours. then she completed her English assignment In 1/4 hours. how much more time did Lisa spend on her history assignment? what your reaction in simplest form.

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]