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KonstantinChe [14]
3 years ago
12

The first term of an arithmetic sequence is –12 and the ninth

Mathematics
1 answer:
shtirl [24]3 years ago
8 0

Answer:

d = \frac{7}{2}

Step-by-step explanation:

The nth term of an arithmetic sequence is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Given a₉ = 16 , then

- 12 + 8d = 16 ( add 12 to both sides )

8d = 28 ( divide both sides by 8 )

d = \frac{28}{8} = \frac{7}{2}

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