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lora16 [44]
2 years ago
15

Find the sum of the arithmetic series given a1

Mathematics
2 answers:
Kay [80]2 years ago
5 0
It’s B trust me I know
stich3 [128]2 years ago
4 0

Answer:

D

Step-by-step explanation:

The sum to n terms of an arithmetic series is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

where a₁ is the first term and d the common difference

Here a₁ = 12, d = 4 and n = 30 , then

S_{30} = \frac{30}{2} [ (2 × 12) + (29 × 4) ]

     = 15(24 + 116)

     = 15 × 140

     = 2100 → D

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Explanation:

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