Answer:
7^3
Explanation:
7 x 7 x 7 is 7 times the third power. Hence the cubic sign.
This is because your problem you have shown is multiplying 7 three times. There for it is "7^3"= 21
just like how 7x7x7=21 Its just an easier way of writing it.
Hope this helps!
-Payshence
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