One type of plant root splits 4 times while growing in the ground the number of new roots after each split can be modeled by the function f(x)=3× where x is the number of times the plant root splits what is the domain of f(x)

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]