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OpenStudy (anonymous):
PLEASE HELP! MEDAL WILL BE REWARDED!! Write the sum using summation notation, assuming the suggested pattern continues. 9 - 18 + 36 - 72 + ...
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OpenStudy (badhi):
$$\sum\limits_{i=0}^n 9\times(-2^i)$$
OpenStudy (anonymous):
Thank you so much!!! I just needs to make sure that i was getting the correct answer!
OpenStudy (badhi):
you're welcome
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