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sveta [45]
4 years ago
14

Please help 15 points thank you

Mathematics
1 answer:
inysia [295]4 years ago
7 0

Answer:

S28 = 28/2 (5+248)

Step-by-step explanation:

The sum of an arithmetic series is given by

Sn = n/2 ( a1 + an)

n = 28  

We need to find the first and last terms

a1 = 9(1) -4 = 5

a28 = 9(28) -4 =248

S28 = 28/2 (5+248)

         =14 *(253)

         3542

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