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Ivanshal [37]
3 years ago
14

I need help. With this p

Mathematics
1 answer:
iogann1982 [59]3 years ago
6 0

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

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5 0
3 years ago
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Aleksandr [31]

Answer:

a=\frac{3}{x^{2} }

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Step-by-step explanation:

we are given

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comparing both sides we get

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a=\frac{3}{x^{2} }

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4 0
3 years ago
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Step-by-step explanation:

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8 0
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3 years ago
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WINSTONCH [101]

Step-by-step explanation:

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.............

7 0
3 years ago
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