chelseamontgome chelseamontgome

10-04-2018
Mathematics

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What is the sum of the first 14 terms of the sequence
an= 6n - 12

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jcherry99 jcherry99

10-04-2018

Term 1 = 6*1 - 12
Term 1 = 6 - 12
Term 1 = - 6

Term 14 = 6*14 - 12
Term 14 = 84 - 12
Term 14 = 72

Number of terms = 14

Sum = (term1 + Term14)*number of terms / 2
Sum = (-6 + 72)*14/2
Sum = 66*14/2
Sum = 462

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