CPM Homework Help : CCA2 Problem 10-62

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10-62.

Write each series in sigma notation and find the sum or an expression for the sum.

$47 + 34 + 21 + … + (-83)$
Hint (a):
What is the expression for the sequence?
More Help (a):
How many terms are there in the series?
Answer (a):
One possible answer:
$\displaystyle\sum_{k = 1}^{11}(60-13k)=-198$

$3 + 10 + 17 + … + (3 + 7(n - 1))$
Hint (b):
Instead of going up to a specific term, this series sums up the first n terms of the sequence given in parentheses.

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