Which of these is the length of the interval $(- 12, 21)$ ?

9

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- 9

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33

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- 33

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Solution

The correct option is C $33$
Length of an interval $(x, y)$ is given by $| y - x |$ .
So we get length of interval $(- 12, 21)$ $= | 21 - (- 12) | = 33$

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