Answers

2016-06-28T18:51:09+08:00
A₃ = a₁ + (n-1)d
9/10 = 5/2 + (3-1)d
9/10 = 5/2 + (2)d
9/10 - 5/2 = 2d
-8/5 = 2d
-4/5 =d

a₆ = a₁ + (n-1)d
a₆ = 5/2 + (6-1) -4/5
a₆ = 5/2 + (5)-4/5
a₆ = 5/2 -4
a₆ = -3/2
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