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This is simply done by entering 21 into the calculator, and hitting the square root sign. This answer, rounded to the nearest tenth is 4.6.
The answer is 7.1
7.9
10
2
39
The answer is 8.1
It is: 9.1
To the nearest tenth - it's 3.5
It's 125.1 (rounded to the nearest 10th).
1.7
They are -4.6 and +4.6
3.74