(9x9)^4:10?
The expression can be simplified as follows:
(9x9)^4:10 = 81^4:10
81 raised to the power of 4 (81^4) is equal to 43,046,721.
Now, dividing 43,046,721 by 10 gives us:
43,046,721:10 = 4,304,672.1
Therefore, (9x9)^4:10 equals approximately 4,304,672.1.