Alan G. answered • 04/25/16

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You are given a

_{1}= 1000. After (n-1) years, the number of birds decreases by 10% and 40 new birds are added, so the number at the start of the nth year is:a

_{n}= .9a_{n-1}+ 40.Explanation: Since 10% are lost each year, 90% = .9 are left. .9a

_{n-1}is the number of birds from the last year times 90%.
Bill P.

04/29/16