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If \(P=\frac{3}{2}\) and \(Q=\frac{11}{2}\) on the number line, what is the length (PQ)?

Answer and explanation

Correct answer: (4)

The direct answer is option A, 4. Length on a number line is the absolute difference between the coordinates. Substitute the given values: \(PQ=\left|\frac{11}{2}-\frac{3}{2}\right|=\left|\frac{8}{2}\right|=|4|=4\). Option A is correct. Option B, \(\frac72\), results from an incorrect numerator subtraction and is 3.5, not the actual gap. Option C, 5, is the coordinate of Q, not the distance from P to Q. Option D, \(\frac{11}{2}\), is again just Q's coordinate, not the length of the segment. Since Q is to the right of P, we may also subtract directly without changing the sign, but absolute value is always safe. Exam cue: distance is not an endpoint coordinate; it is the difference between endpoints.

Related tags

PolynomialsNumber-LineDistanceFractions

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