You can perform all kind of operation that are one the inverse of the other, so that the value won't change. For example, you can multiply and divide by 2:

Or add and subtract 5:

Answer:
That'll help a lot of people in the future ^.^
Step-by-step explanation:
Integers are whole numbers so the answer is -3
I'm calculated and I figure that it's graphing
For number 2. The pilot flew 4 circuits and in total by the 5th day he flew 14 right?