What is 60 divided by 57 give answer in decimal form

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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]

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?