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In Fig. 7.2, the points $A(4,0)$ and $B(6,0)$ lie on the $x$-axis. What is the distance $AB$? 
A1 unit
B2 units
C4 units
D10 units
Answer & Solution
Correct answer: B. 2 units
Since both points lie on the $x$-axis, the distance between them is the difference of their $x$-coordinates: $|6-4|=2$ units.

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