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24-05-2022
Mathematics

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Find the sum if the first 80 even integers beginning with -78

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anomalocaris anomalocaris

24-05-2022

Answer:

162

Step-by-step explanation:

sum (n=-39) (to 41) of (2n) = 162

It won't let me put in a picture, but that is the formula I used.

-39 is one half -78, because I'm using 2n

41 = -39 + 80

2n is so we only get even numbers

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