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Finding the sum of the first 27 terms of the A.P help!?

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Finding the sum of the first 27 terms of the A.P 10, 18, 26, ...

arithmetic-sequence

asked Jul 10, 2014 in ALGEBRA 2 by anonymous

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1 Answer

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The arithmetic sequencs 10, 18, 26, ...

Formula for sum of the terms in A.P

Where n = number of terms, a = first term, d = common difference.

In this case

Substitute n = 27, a = 10 and d = 8 in

Sum of first 27 terms of the sequence 10, 18, 26.... is 3078.

answered Jul 10, 2014 by david Expert

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