Select all that apply. 20 POINTS
Two great science and mathematics ideas from the Gupta Empire are .

A. the prediction that the earth was round
B. major advances in calculus
C. the belief that the earth rotated on an axis
D. invention of the binary system

During the end of the 19th century and the early 20th century the was becoming one of the most popular instruments in america? banjo fiddle guitar pianola (player piano) tambourine

Rivalries between european imperialist powers and the growth of european militaries contributed to which outcome in the early 20th century? o a. many european powers were eager to go to war with one another. o b. european states became less concerned about controlling overseas empires. o c. small countries became more willing to join powerful empires. o d. the alliance system that maintained a balance of power in europe broke down.

Identify the reason each country wanted to go to war in the year before and during world war 1