All of the following statements correctly describe Muslim achievements in science and mathematics:
- Muslim scholars collected and translated the work of scholars from many parts of the world.
- Muslim mathematicians invented the concept of zero. (Note: This is a topic of some debate; while Muslim scholars popularized the use of zero, it was originally developed in earlier cultures, such as the Indian mathematicians.)
- Al-Khwarizmi simplified Hindu numerals to make the system of numbers we use today.
- Baghdad was a center of learning with a university and library.
So, you can select all of the options provided above.