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Juliette [100K]
3 years ago
12

Please help!! Giving brainliest and extra points!! (Click on photo)

Mathematics
1 answer:
ivolga24 [154]3 years ago
3 0

Answer:

45

Step-by-step explanation:

12 x 2.5= 30

5 x 6=30

30/2=15

30+15=45

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kupik [55]
Find a_{1} by plugging in 1 into n:
a_{1} = 98-2(1)=96

Find a_{11 by plugging in 11 into n:
a_{11} = 98-2(11)
a_{1} =98-22=76

Now to find the sum your formula is:
S_{n} = \frac{n}{2} ( a_{1} + a_{n})
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Now plug that into the formula
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S_{11} = 5.5(172)=946

Hope that helps
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