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OpenStudy (wade123):
Write the sum using summation notation, assuming the suggested pattern continues. -3 + 6 + 15 + 24 + ... + 132
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OpenStudy (wade123):
my answer:
OpenStudy (anonymous):
OpenStudy (anonymous):
580.5 right....?
OpenStudy (wade123):
what?
OpenStudy (anonymous):
a=-3 c.d d=15-6=9 l=a+(n-1)d 132=-3+(n-1)9 132+3=(n-1)9 n-1=135/9=15 n=15+1=16 so your answer is correct.
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