Answer:
No
Step-by-step explanation:
You can only have the same denominator
Example:
2 3 5
- + - = -
9 9 9
M4 would be choice b I know this because I put it in the calculator
I believe this is the distributive property.
Answer:

Step-by-step explanation:
It's already in a form that only ha positive exponents. Just to state it though you could rewrite it as
or
The question asks for positive exponents though so yu don't need to do that.
You also need to know
so in this case 
so 