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OpenStudy (anonymous):
PLEASE HELP! MEDAL WILL BE REWARDED! Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131 I just need to make sure i have the correct answer!!
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OpenStudy (anonymous):
an = a1 +(n-1)d first find n from here
OpenStudy (badhi):
@CarlyLiberty: Can you tell us what your answer is?
OpenStudy (anonymous):
yes it s \[\sum_{n=0}^{n}(-4+9n)\]
OpenStudy (anonymous):
|dw:1360076901982:dw| this is the answer
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