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If point Q is 1.5 units to the left of 2 on the number line, what is the value of Q?

Answer and explanation

Correct answer: 0.5

The governing concept is directed movement on a number line. Moving to the right increases a coordinate, while moving to the left decreases it. Starting at 2 and moving 1.5 units left therefore requires subtraction: Q = 2 − 1.5 = 0.5. Thus option B is correct. A quick check is that 0.5 is indeed 1.5 units to the left of 2, because 2 − 0.5 = 1.5. Option A comes from adding instead of subtracting, option C gives the distance moved rather than the final coordinate, and option D would be obtained by moving 2.5 units left or by using an incorrect subtraction. The direction word “left” determines the operation.

Related tags

Number-LineDirected-DistanceSubtractionRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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