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Maurinko [17]
3 years ago
14

The first term of an arithmetic sequence is 14. The 25th term is 206. What is the common difference of the arithmetic sequence?

Mathematics
2 answers:
larisa [96]3 years ago
3 0

an = a1+ d(n-1)

a1 =14

an=206  when n=25

206 = 14 + d (25-1)

206 = 14 + d * 24

subtract 14 from each side

192 = 24d

divide by 24 on each side

d=8

The common difference is 8

REY [17]3 years ago
3 0

an atirmetic sequence  can be written in form

a_n=a_1+d(n-1)

where a_n is the nth term

a_1 is the first term

d is the common difference

n is the counter variable


so, given that first term is 14 (a_1=14) and given taht 25th term is 206 (a_{25}=206), we want to find d


a_{25}=206

a_{25}=a_1+d(25-1)

206=14+24d

minus 14 both sides

192=24d

divide both sides by 24

8=d

the common difference is 8

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