Explanation:

- A school district is discussing a 5% increase in the school year.

- The current number of days in a school year is 180.

- To find the increased days, multiply 180 by 5% (0.05).

- The increase is 9 days (180 times 0.05).

- Add these 9 days to the current 180 days.

- The total is 189 days with the proposed increase.

Option 4: 189 days is correct