Please help meee! I will give brainleiest!

Write a story that matches with the expression 42x-5 pls hurry

Find the domain of the following expression: 1/(√x)-2

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]