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The third term of an arithmetic profession is 90 and the eleventh is 50.. what is the common difference?
8 years ago

Answers

Damon
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

a3 = a1 + 2 d = 90

a11 = a1 + 10 d = 50
-----------------------subtract
a3-a11 = 0 -8 d = 40
so
d = -5
8 years ago

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