why in adding and subtracting scientific notation, you need the same power of 10 whereas in multiplying and dividing scientific notation, you can have two different powers of 10?

Don't just ask for help, try to solve it by yourself, try speaking with a parent or a teacher to help your problem!

Explanation:

I am saying that you need real people to help you. They can help your everytime if your internet breaks.

2, 2, 2 or -4, 20, 29

step-by-step explanation:

there is two ways you can do it.