Question

From the sum of –52 and –45, subtract –69.

Answer 1

Answer:

The sum is a+b. The difference is a-b. Adding the sum to the difference is (a+b) + (a-b) which is a + b + a - b = 2a. So you see that half of this is one of the original numbers (a).

Step-by-step explanation:

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Answer 2

Answer:

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