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Anna11 [10]
3 years ago
11

Find an equation for the nth term of the arithmetic sequence.

Mathematics
2 answers:
Sunny_sXe [5.5K]3 years ago
5 0

Answer:

asdop

Step-by-step explanation:

balandron [24]3 years ago
4 0

Answer:

an = 896 - 53(n - 1)

a _{19} =  l + (19 - 1) \times d \\  - 58=  l+ 18d -  -  - (i) \\  \\ a _{21} =  l + (21 - 1)d \\  - 164 =  l + 20d -  -  - (ii) \\ (ii) - (i)  :  \:  - 106 = 2d \\ d =  - 53 \\ hence : l =  - 58 - (18 \times  - 53) \\ l =  896 \\  =  > a _{n} =   896 + (n - 1) \times  - 53 \\ a _{n} =  896  - 53 (n - 1)

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