How did advancements during the Gupta period transform mathematics? A. They invented algebra.

B. They created the concepts of "square numbers" and "square roots."

C. They developed a decimal system with a numeral for zero.

B. They made progress in metallurgy

c. troops marched forward in close formation against newer, more accurate weapons

soviet influence spread across eastern europe sharply during and after wwii. the soviet armies liberated the countries in eastern europe and occupied them from the germans as they were forced to retreat towards germany.