Question

Which is the 25th term of the arithmetic sequence where a1 = 8 and a9 = 80 ?

Answer 1

224

Answer 2

a = 8

a + 8d = 80

8 + 8d = 80

d = 9

a + 25d = 8 + 25(9) = 233

Answer 3

@moneybird 25th term will be "a+24d" i think

Answer 4

yes

Answer 5

25th term is 224

Answer 6

oops

Answer 7

a + 24d = 8 + 24(9) = 8 + 216 = 224 is the 25th term

Answer 8

medal medal

Answer 9

224

Answer 10

a9=a1+(9-1)D
a1=FIRST TERM
D=common difference
80=8+8*D
D=9
a25=a1+(25-1)D
a25=8+24*9
a25=224

Answer 11

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