Answer:
Yes
Explanation:
I will do question 4 so you understand: What there asking is for you to simplify.
This is how you do so.
step 1 find the numbers that have the same letter
Step 2 If you find one for example 7y and 3y you add them which is 10y
Step 3: Any letters that are by them selves and the question doesn't give you a value ignore!
Hope this helps!!