The answer is D: all of the above!
Answer:
The parts of an expression or equation being added or subtracted.
Explanation:
I think online education is becoming so popular because they're many people who can't go to school for various reasons; Maybe because of health problems, far house, or maybe just because they wanna stay at home! You can do multiple activities during the school year if you're studying online. And guess what! You can study from ANYWHERE and ANYTIME you want to!
<em>This is what I <u>know</u>, I hope it helps you!</em>
