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3^4 or 9^2
positive powers of ten are standard form, this is when large numbers are simplified to make math easier e.g 100000000 is 1x10^9
(3 x 100) + (2/10^1) + (9/10^2)
To evaluate the expression (4x10^4)(2x10^5), you first multiply the numbers 4 and 2 to get 8. Then, you multiply the powers of 10 by adding the exponents, which gives you 10^(4+5) = 10^9. Therefore, the final answer is 8x10^9.
10 to the power of 15 when multiplying items with the same base (in this case 10) you simply add the powers