Question

Which is the 25th term of the arithmetic sequence where a1 = 8 and a9 = 64 ? Which is the 25th term of the arithmetic sequence where a1 = 8 and a9 = 64 ? @Mathematics

Answer 1

a9 = 8 + d(8)

(64-8)/8 =d

8-1 = 7

an = 8 + 7(n-1)

Answer 2

Try to break the numbers into smaller numbers, then you will see clearer the pattern.

Answer 3

then: a25 = 8 + 7(24)

Answer 4

Yay <3 someone that remembers this :) Thank you so much.