X to the 7th power. X^m*X^n=X^m+n That means when you multiply variables with the same base, you add the exponents.
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X to the fourth power is... X times X times X times X
Multiply 9 by itself three times (9 x 9 x 9) to find out. That's what the third power means. For the fourth power, you'd multiply again.
it is 1000 taking away 200 4 times
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A number is x squared plus forty four is equal to the number x to the fourth power times three?