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In the sequence – 40, –33, –26, –19, … determine the 77th term and the sum of the first 90 terms?

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#help-me
#geometric-series

asked Aug 14, 2017 in ALGEBRA 2 by anonymous
reshown Aug 14, 2017 by goushi

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1 Answer

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Step 1:

The sequence is

Find the term.

The sequence is arithmetic sequence.

Calculate the common difference,

d = second term - first term

First term

Find the sum of the first terms.

Number of terms

Calculate the sum of the sequence by using the formula.

Solution:

answered Aug 14, 2017 by Anney Mentor

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