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mote1985 [20]
3 years ago
6

PLEASE HELP WITH THIS QUESTION!! DUE BY 1PM! wILL RATE YOU GOOD!! THANK YOU!!

Mathematics
1 answer:
kupik [55]3 years ago
8 0
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})
n = 11,   a_{1} = 96 ,  a_{11} =76

Now plug that into the formula
S_{11} = \frac{11}{2} (96+76)
S_{11} = 5.5(172)=946

Hope that helps
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