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I need help. With this p
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I need help. With this p

I need help. With this p-example-1
User Xronx
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1 Answer

6 votes


a_n=a_1+(n-1)d - the formula of n-th term of an arithmetic sequence.

We have:


a_5=12.4;\ a_9=22.4


a_9-a_5=(9-5)d\to4d=22.4-12.4\\\\4d=10\ \ \ \ |:4\\\\d=2.5


a_(31)=a_9+(31-9)d\to a_(31)=22.4+22\cdot2.5=77.4

Answer: C. 77.4

User Ozk
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