Hello!
Answer:

Explanation:
→ We want to find the next term of this sequence:

→ The sequence (-1, -3, -5, -7, -9, ...) is an arithmetic sequence because the difference between any two consecutive terms is constant.
→ The common difference is -2.
→ So the next term of this sequence is equal to:

Conclusion:
The next term of the sequence (-1, -3, -5, -7, -9, ...) is -11.