Question

Solve 13 14 15 please.

Answer 1

`x^2=144\\\\x=\pm√(144)=\pm12\ because\ (\pm12)^2=144\\\\x^3(25)/(289)\\\\x=\pm\sqrt{(25)/(289)}=\pm(5)/(17)\ because\ \left(\pm(5)/(17)\right)^2=(25)/(289)\\\\x^3=216\\\\x=\sqrt[3]{216}=6\ because\ 6^3=216`