A will always be an odd number.
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it's only negative if it's being multiplied by a positive number. If it's being multiplied by another negative number than it will be positive.
A divisible number is a number that is capable of being divided.
Is a number being multiplied by another number.
It is a coefficient.
Being divisible by 4, means that it will also be divisible by 2, so that doesn't tell you anything about divisibility by 8. But if you divide the number by 2, and this quotient is divisible by 4, then yes the original number is divisible by 8.