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3 years ago

If −20 is the 15th term in an arithmetic sequence with a common difference of −7, what is the first term in the sequence?

Mathematics

1 answer:

Sphinxa [80]3 years ago

8 0

An=A1+(n-1)d
-20=A1+(15-1)x-7
-20=A1+14 x -7
-20=A1-98
+98 +98
-98+98=0
-20+98=78
A1=78

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