Time remaining:
use your formula to find the sum of the terms in each of the following sequence: a.) 3, 9, 15, 21

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Oct 13th, 2014

a=3

d=9-3=15-9=6

number of terms = 4

sum = n/2[2a+(n-1)d]

        = 4/2[2*3+(3-1)6]

        = 2[6+2*6]

        = 2[6+12]

        = 2*18

        = 36

Oct 13th, 2014

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Oct 13th, 2014
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Oct 13th, 2014
Sep 22nd, 2017
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