Question

Which is the 25th term of the arithmetic sequence where a1 = 7 and a9 = 47

Answer 1

Try it.

Answer 2

Common ratio is 40/8 = 5.
Just substitute into the formula.

Answer 3

Common difference*

Answer 4

the rule would be \[a _{n} = 5n + 2\]
So term 25 would be 25(5) +2 = 127.

Answer 5

\( \color{Black}{\Rightarrow \large a_n = a_1 + (n - 1)d }\)