PLS HELP BEST AWNSER GETS BRAIN THINGY

Solve the triangle. a = 21°, c = 105°, c = 5

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625

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]