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What is the distance between (-2.75) and (1.25) on the number line?

Answer and explanation

Correct answer: (4) units

The direct answer is option B, 4 units. Distance on a number line is the absolute difference between the two coordinates. Taking the larger coordinate minus the smaller one gives \(1.25-(-2.75)=1.25+2.75=4\). The negative sign changes subtraction into addition because subtracting a negative is adding. Option A, 3 units, is incorrect because it does not cover the whole interval from -2.75 to 1.25. Option B, 4 units, is correct. Option C, 4.5 units, results from an arithmetic error and is too large. Option D, 5 units, is also too large; it may come from rounding or adding incorrectly. A distance cannot be negative, and here the two points lie on opposite sides of zero, so their magnitudes add: 2.75+1.25=4. Exam cue: when one endpoint is negative and the other positive, add the distances from zero.

Related tags

PolynomialsNumber-LineDecimal-DistanceMedium

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