Answer this please...

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

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]