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Question 1: Both are correct. you just took under root.
Q2.
![[ {4}^{ - 7} \div {4}^{ - 10}] \times {4}^{ - 6} \\ \\ = [{4}^{ - 7-(-10)} ] \times {4}^{ - 6} \\ \\= {4}^{-7+10}] \times 4^{-6}\\ \\ =4^3 \times 4^{-6}\\ \\ = 4^{3+(-6)}\\ \\ =4^{-3}\\ \\ = \frac{1}{ {4}^{3} } \\ \\ = \frac{1}{64} [ {4}^{ - 7} \div {4}^{ - 10}] \times {4}^{ - 6} \\ \\ = [{4}^{ - 7-(-10)} ] \times {4}^{ - 6} \\ \\= {4}^{-7+10}] \times 4^{-6}\\ \\ =4^3 \times 4^{-6}\\ \\ = 4^{3+(-6)}\\ \\ =4^{-3}\\ \\ = \frac{1}{ {4}^{3} } \\ \\ = \frac{1}{64}](https://tex.z-dn.net/?f=%5B+%7B4%7D%5E%7B+-+7%7D+++%5Cdiv++%7B4%7D%5E%7B+-+10%7D%5D++%5Ctimes++%7B4%7D%5E%7B+-+6%7D+%5C%5C+%5C%5C+%3D+%5B%7B4%7D%5E%7B+-+7-%28-10%29%7D++%5D++%5Ctimes++%7B4%7D%5E%7B+-+6%7D+%5C%5C+%5C%5C%3D+%7B4%7D%5E%7B-7%2B10%7D%5D+%5Ctimes+4%5E%7B-6%7D%5C%5C+%5C%5C+%3D4%5E3+%5Ctimes+4%5E%7B-6%7D%5C%5C+%5C%5C+%3D+4%5E%7B3%2B%28-6%29%7D%5C%5C+%5C%5C+%3D4%5E%7B-3%7D%5C%5C+%5C%5C+%3D+%5Cfrac%7B1%7D%7B+%7B4%7D%5E%7B3%7D+%7D++%5C%5C++%5C%5C++%3D++%5Cfrac%7B1%7D%7B64%7D+)
Q3.

Q2.
Q3.
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