Posted by theresa on Wednesday, April 27, 2011 at 11:10pm.
a(n+1)=a(n)/2 -5
a1=90
a2=90/2 -5= 45-5= 40
a3=40/2 -5= 20-5= 15
a4=15/2 -5= 7.5-5= 2.5
The next number is 2.5
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