The 16th term of an arithmetic sequence is -8 and the first term is 12. what is the common difference, d?

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asked Jun 20, 2019 189k views

2 Answers

Anshu · Answer 1 · 2019-06-24T16:46:03+0000

so the first term a=12
the formula for arithmetic sequence is
xn=a +d(n-1)

x16th= 12+d(16-1)=-8
12+15d= -8
15d = -8-12
d=-20/15= -4/3
the common difference is d =-4/3

The 16th term of an arithmetic sequence is -8 and the first term is 12. what is the common difference, d?

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