Just make an apointment with the professor because if u contact your professor with telephone,most of the time they dont even bother to pick up their phone. The same thing as email. They might dont even check their email at times
The correct answer to this open question to this open question is the following.
Although there are no options for this question we can say the following.
Indian mathematics was able to make great advances in the 3rd and 2nd century BCE, in part because of their development of the decimal system and the invention of "zero."
Indians were smart people and great mathematicians. Great Indian mathematicians such as Brahmagupta or Aryabhata, also developed concepts on algebra negative numbers, and trigonometry that are applicable in modern-day mathematics. From India, these concepts spread to other far regions such as the Middle East or China, where other mathematicians and scholars improved these concepts.
