Can you please help me with this.. you only have to do the first one (a)

Which of the following circles have their centers on the x-axis? check all that apply.

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]

Biggest exam of the which of the following are polynomial functions?