Question

Which of the following number sentences best describes the problem shown on the number line?

• A. $-2+(-4)$
• B. $-5+3$
• C. $5+(-3)$
• D. $-4+2$

Answer 1

The correct option is D $-4+2$

Length of upper Ray $\overline{AB}=2$ units

Direction of this Ray is in $+x$ direction

$\Rightarrow$ $\overline{AB}=+2$ units

Length of bottom Ray $\overline{CD}=4$ units

Direction of this Ray is in $-x$ direction

$\Rightarrow$ $\overline{CD}=-4$ units

Thus $\overline{AB}+\overline{CD}=+2-4$ ints