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What is the distance of (-\sqrt{0.81}) from (0) on the number line?

Answer and explanation

Correct answer: (0.9)

The direct answer is option B, 0.9. First calculate the square root: \(\sqrt{0.81}=0.9\), since \(0.9^2=0.81\). The point is \(-\sqrt{0.81}=-0.9\). Distance from zero is the absolute value, so \(|-0.9|=0.9\). Option A, 0.09, is incorrect because \(0.09^2=0.0081\), not 0.81. Option B, 0.9, is correct. Option C, 1.8, doubles the distance and would represent the distance between -0.9 and +0.9, not between -0.9 and zero. Option D, 9, ignores the decimal place and is much too large. Notice that the negative sign tells the side of zero, while distance tells how far and is non-negative. Memory cue: position may be negative, but distance from zero is its magnitude.

Related tags

Number-LineDistanceDecimal-RootAbsolute-Value

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