–14, –7, 0, 7, 14, … Find the 19th term…

1 answer:

7 0

-14,-7,0,7,15....this is an arithmetic sequence with a common difference of 7.

an = a1 + (n-1) * d
n = term to find = 19
a1 = first term = -14
d = common difference = 7
time to sub and solve :)

a(19) = -14 + (19 - 1) * 7
a(19) = -14 + 18 * 7
a(19) = -14 + 126
a(19) = 112 <===

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