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Sticky Note
The square root of -9 is?
  1. -81
  2. 81
  3. 18
  4. -18
Explanation

-9×-9=81

So B is correct

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The average age of 5 members of a family is 21. If the age of grandfather is included, the average age is increased by 9 years. What is the age of grandfather?
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