The regular polygon below is rotated about its center. Which angle of rotation will carry the figure onto itself?

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

Atriangle has sides with lengths of 10 yards, 13 yards, and 18 yards. is it a right triangle?

Need ! give step by step solutions on how to solve number one [tex]\frac{9-2\sqrt{3} }{12+\sqrt{3} }[/tex] number two [tex]x+4=\sqrt{13x-20}[/tex] number three (domain and range) [tex]f(x)=2\sqrt[3]{x} +1[/tex]