1. Find the sum of the first 10 terms of the arithmetic sequence whose first term is 5 and whose last term is 40.
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1. Find the sum of the first 10 terms of the arithmetic sequence whose first term is 5 and whose last term is 40.
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SUM = (n/2)(a1 + an)
where
a1 = first term
an = last term
SUM = (10/2)(5+40)
= (5)(45)
= 225