Difference 61133

Determine the difference of the arithmetic sequence (an), if given: a1 = 5, an = 23, Sn = 392

Correct answer:

d =  0.6667

Step-by-step explanation:

a1=5 a=23 s=392  s = 2a1+a n  n=2 s/(a1+a)=2 392/(5+23)=28  a = a1 + (n1) d  d=n1aa1=281235=320.6667   Verifying Solution:  a28=a1+27 d=5+27 32=23 s28=2a1+a28 n=25+23 28=392

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