ANSWER: 3 ways
WHY:
Say there was 4 winners that got the silver than the next 4 got the silver medal and then last of the next 4 got the bronze 4+4+4=12 then among each of the ones that went across the finish line first and then the next four and then the next they would be equal among each other.
You need to provide the last question. There isn’t enough information to help you. I’m sorry
If you could show a photo I could answer the question
Answer: No
Step-by-step explanation:

its exponents are;
a=1
b=2
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its exponents are;
a=2
b=1
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For them to be like terms, a = 1 and b = 2 or viceversa in both of them.