719729
10.12.2020 •
Mathematics
Arithmetic Sequence:
original formula: Sn=n/2 (2u1+(n-1)d)
problem formula: S20= 20/2 (2x60 (20-1)(-3)) =630.
The sum of the sequence is 630, but, i need help understanding HOW it is 630. i dont know what to multiply/add/divide in the series first, i don't understand how they got the answer to be 630. Could someone give a detailed explanation on how to work out the problem and parentheses step by step? Thank you
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Ответ:
its actually A
Step-by-step explanation: