Evaluate each arithmetic series described
a1 = 9, d= -7, n= 12

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the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

236 cm 16 time 12 = 192

6 times 7 = 42

192+42

8.3 and the 3 is repeating

hope this .