Answers

2016-06-29T17:08:20+08:00
A1=-4,a5=8;n=8
an=a1+(n-1)d
a5=-4+(5-1)d
8=-4+4d
8+4=4d
12=4d
12/4=4d/4
d=3

a1=-4
a2=-1
a3=2
a4=5
a5=8
the arithmetic mean between -4 and 8 is -1,2,and 5
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