Final answer:
Paul wrote a letter to the Romans to establish Christian teachings, address issues within the church, and seek support for his missionary work.
Step-by-step explanation:
Paul wrote a letter to the Romans for several reasons. One reason was to establish a solid foundation of Christian teaching and beliefs with the Roman church, just as he did with other churches he established. He also wanted to address some specific issues and conflicts within the Roman church, such as divisions between Jewish and Gentile believers. Additionally, Paul wanted to express his intention of visiting Rome and seek support for his missionary work in Spain.