What did pythagoras study in his most famous musical experiment

acoustics of strings

Explanation:

Pythagoras was a Greek philosopher (6th century BC) whose experiments on the characteristics of vibrating strings that generate pleasant musical intervals led to a tuning system with his name: the Pythagorean tuning.

His discovery of perfect intervals got his experiments to be considered as the beginning of the science of acoustics.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.

b. martin luther king jr. wrote and spoke "i have a dream"

explanation:

i know this 100 percent is correct   b. is the best one. < 3