Final answer:
The sum of 1−2 and 1−18 is calculated by adding the expressions together, resulting in -18, which is 'None of the above' for the provided options.
Step-by-step explanation:
The question asks to find the sum of 1−2 and 1−18. To solve this, we simply add together the two expressions:
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- (1 - 2) + (1 - 18)
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- = 1 - 2 + 1 - 18
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- = (1 + 1) - (2 + 18)
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- = 2 - 20
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- = -18
The sum of 1−2 and 1−18 is -18, which matches with none of the answer choices provided, implying that the correct option is None of the above.