Five tasks need to be completed: Task 1, Task 2, Task 3, Task 4, and Task 5. Task 2 must be completed before Task 3, and Task 4 must be completed before Task 5. Task 1 can be done at any time. What is a valid order of completion?
If '+' represents addition, '-' represents subtraction, '×' represents multiplication, and '÷' represents division, what is the value of 8 ÷ 2 × 4 + 6 - 3?