Yes.
Any physical quantity which has both direction and magnitude is called a vector. A quantity must also obey the 'Triangle law of vector addition' to be called as a vector. For example displacement is a vector, u can say a person moved 5 km (magnitude) along west(direction). But electric current is not a vector, it has magnitude and its direction is from +ve terminal to -ve terminal but it doesn't obey triangle law. Rather currents are added as scalars.
Yes.
Yes subtraction of vector obeys commutative law because in subtraction of vector we apply head to tail rule
Yes.
Yes, complex numbers obey the commutative property of addition.
Yes! his every comand
Answer: every citizen has a duty to obey the law.
The same as He expects from every christian trust and obey. Trust God to lead you, guide you, provide for you and obey as He works in your life.
Respect yes, blindly obey... I'm not so sure. If you are talking about your parents/guardians then yes. If you are talking about your teachers/spiritual leaders etc a qualified yes. If you are talking about a random older person, use your best judgment. And even if you choose not to obey them it is not necessary to be rude about it.
every month
They are all numbers and obey the same rules for addition, subtraction, multiplication, division, exponentiation etc.
The verb is merely, obey. I obey, you obey, he, she, it obeys. One may be obedient to someone, but one does not "obey to" someone.