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OpenStudy (anonymous):
What is the sum of a 30-term arithmetic sequence where the first term is 73 and the last term is -10? can someone show me how to do this please?
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OpenStudy (anonymous):
-101 not -10
OpenStudy (amistre64):
what is the sum of the first and last term?
OpenStudy (anonymous):
-28
OpenStudy (amistre64):
what is half of that?
OpenStudy (anonymous):
-14
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OpenStudy (amistre64):
and 30 times -14 is? the formula that relates to this is just: \[\frac{n~(first+last)}{2}\]
OpenStudy (anonymous):
-420
OpenStudy (amistre64):
then -420 it is
OpenStudy (anonymous):
Thankyou for your help. That clears things up
OpenStudy (amistre64):
good luck
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