Question

10 + (-9) +(-10) –(12)​

Answer 1

Answer:

10-9-10-12

1-10-12

-9-12

-21

Step-by-step explanation:

(+)and (-) = becomes(-)

Answer 2

Answer:

$10 + ( - 9) + ( - 10) - 12 \\ \rightarrow \: 10 - 9 - 10 - 12 \\ \rightarrow \: 1 - 22 \\ \rightarrow \: - 21$

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