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Explain how to calculate 75 + 72 + 69 + 66 + ... + 21 + 18 + 15 + ... + (-69) + (-72) + (-75) without a calculator.

 Sep 7, 2022
 #1
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literally just simplify

 Sep 7, 2022
 #2
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All the terms cancel out. 

 

The positive 75 cancels with the negative 75; the positive 72 cancels with the negative, and so on and so forth.

 Sep 8, 2022

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