Answers

2016-06-15T22:40:09+08:00
An = a1 + (n-1)d

a23 = 9 + (22)9

a23 = 9 + 198

a23 = 207
0
2016-06-15T22:50:19+08:00
9, 18, 27
a₂₃ = ?
arithmetic sequence
d = 9
an = a₁ +d(23-1)
a₂₃ = 9 + 9(23-1)
a₂₃ = 9 + 9(22)
a₂₃ = 9 + 198
a₂₃ = 207


0