In addition to conquest, which factor helped spread Islam?

Trade.

Explanation:

Trade was a big part in the spread of Islam and the merging of trade routes during the Golden Age of Islam created the ideal setting for cultural exchange, as merchants, nomads, religious pilgrims, and mercenaries were constantly coming into contact along these routes.

Y is directly proportional to x. If y=30 and x=6, find the value of k (the constant.) Divide both y and x by x. Then you shall get the value of k, which is, in this case, 5. SO the answer is A: She could divide and y-value by its corresponding x-value.