Find the sum of the first 100 terms of the sequence: −30, −40, −50, −60 ,...
1 answer:
Answer:
D= -10
an=a+(n-1)d
a100=-30+(100-1)-10
a100=-30+99x-10
a100=-960
(n/2)(A1+an)
(100/2)(-30-960)
(50)(-990)
= -49500
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Profit=15
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45-30=15
is this for the test on schoolobjects?
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