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Simplify : $8 + 7.9 - {2.1 - 6.3 - (2.1 + 0.9)} - 13.1$

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answer is C.

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Detailed Solution

$8 + 7.9 - {2.1 - 6.3 - (2.1 + 0.9)} - 13.1$

$= 8 + 7.9 - {2.1 - 6.3 - 3.0} - 13.1$

$= 8 + 7.9 - {- 7.2} - 13.1$

$= 8 + 15.1 - 13.1$

= 8 + 2 = 10

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