Answer:
Step-by-step explanation:
Multiply by 2
Like terms are terms that have something in common like an exponent or variable
8. 3a & 16a
9.

&

10.

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11.

&

&

Try 12 & 13 on your own to see if you get the hang of it - if you want me to check it ; put your answer in the comment section of my answer :))) I believe in you .
Answer:
1:5 or you can write 1/5 or 1 to 5
Step-by-step explanation:
The answers are a,a^2. a^1 that means only one a. a^2 means two a's.