The first box would be 3.14 then second box would be the pi symbol and the third box would be 22/7
Say that you're thinking of number 
You multiply it by 8, and have 
You add -1 (i.e., you subtract 1) and have 
This equals -17, so you have

Add 1 to both sides

Divide both sides by 8:

So, you were thinking of -2.
Answer:
800
Step-by-step explanation:
38 rounded up is 40
23 rounded down is 20
2x4=8
add the zeros
800