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-4-2*10 = -4 - 20 = -24
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No 2x10=20 and 2x11=22. They are not equal
It isn't 2X10 = 20, 2X11 = 22
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.