Given the equation y=-(x-1)^2-9 find the cordinates of the vertex of the curve it describes

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]

What are the triple angle formulas? is it related to double angle identities?

Me with these questions , i don’t understand scientific notation!