Muslims in history made significant contributions to the study of?

The theory of numbers, developed and expanded from the original Indian contribution, resulted in the "Arabic numbers" 1 through 9. Islamic scholars also used the concept of zero, which was a Hindu concept. Without the zero, neither mathematics, algebra, nor cybernetics would have developed

Explanation: this is what i got hope it helped ;)

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.