Common EntranceMathematicsSquare Roots

Find the square root of 0.81.

A9
B0.18
C0.9CORRECT
D0.09
AI
Toaster Teacher
Why the answer is C, and why the others tempt you.
0.9 x 0.9 = 0.81, so the square root of 0.81 is 0.9.
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