Write the following in expanded notation. 2. Calculate the following.

1 is in the thousands place ($1 \times 1000$).
2 is in the hundreds place ($2 \times 100$).
5 is in the tens place ($5 \times 10$).
6 is in the ones place ($6 \times 1$).

The expanded notation is $\boxed{\text{1000 + 200 + 50 + 6}}$

8 is in the thousands place ($8 \times 1000$).
1 is in the hundreds place ($1 \times 100$).
0 is in the tens place ($0 \times 10$).
5 is in the ones place ($5 \times 1$).

The expanded notation is $\boxed{\text{8000 + 100 + 5}}$

5 is in the thousands place ($5 \times 1000$).
0 is in the hundreds place ($0 \times 100$).
8 is in the tens place ($8 \times 10$).
5 is in the ones place ($5 \times 1$).

The expanded notation is $\boxed{\text{5000 + 80 + 5}}$

9 is in the thousands place ($9 \times 1000$).
4 is in the hundreds place ($4 \times 100$).
5 is in the tens place ($5 \times 10$).
0 is in the ones place ($0 \times 1$).

The expanded notation is $\boxed{\text{9000 + 400 + 50}}$

6 is in the thousands place ($6 \times 1000$).
0 is in the hundreds place ($0 \times 100$).
0 is in the tens place ($0 \times 10$).
1 is in the ones place ($1 \times 1$).

The expanded notation is $\boxed{\text{6000 + 1}}$

8 is in the thousands place ($8 \times 1000$).
0 is in the hundreds place ($0 \times 100$).
2 is in the tens place ($2 \times 10$).
0 is in the ones place ($0 \times 1$).

The expanded notation is $\boxed{\text{8000 + 20}}$

For question 2, "Calculate the following", the examples provided ($8000 + 100 + 7 = 8107$ and $6000 + 200 + 80 + 5 = 6285$) are already solved in the image. There are no further calculations requested.