You can only add exponents if you are multiplying two of the same variable together. For example,

You take them away if you are dividing.
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In a polynomial equation, you can add together two of the same variable if they have the same exponent
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Or you can take them away in a similar fashion,
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But you cannot add two (or more) different exponents,
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(it does not get any simpler)
I hope this has answered your question, if not, leave a comment and I'll update the answer.
Answer: the answer is 12
Step-by-step explanation:
Answer:
The radius of each circle is 2.5 units
Step-by-step explanation:
Answer:
the first one
Step-by-step explanation: