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Question

Use a number line to evaluate each of the following :
(iii) $(- 1) + (+ 4)$

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Solution

Evaluate the sum using number line.
Given $= (- 1) + (+ 4)$
$\Rightarrow$ $(- 1)$ move $1$ units to the left of $0$ and then for $(+ 4)$ move $4$ units to the right of $- 1.$

$∴ (- 1) + (+ 4) = (+ 3)$

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