hello!
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If something is squared, it's multiplied times itself 2 times.
Example:-
You should also notice that the exponent of 4 is 2.
So if something is squared, its exponent is 2.
If something is cubed, it's multiplied times itself 3 times.
Example:-
You should also notice that the exponent of 4 is 3.
So if something is cubed, its exponent is 3.
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note:-
Hope everything is clear; if you need any clarification/explanation, kindly let me know, and I will comment and/or edit my answer :)