Question

I don’t understand what this question says, please help :(

Answer 1

Explanation:

d = 9 ----> d is common difference

`a_(1) = 5\\\\` ----> first term

In arithmetic sequence, the difference between two terms is constant.

to find nth term,

`a_(n) = a_(1) + (n-1)d\\\\a_(15) = 5 + 14*9\\\\ = 5 + 126\\= 131`

Answer 2

a(15) = 131

Explanation:

Explicit Arithmetic Sequence Formula: an = a1 + d(n - 1)

We are given a1 and d, so plug them in:

an = 5 + 9(n - 1)

To find the 15th term, plug 15 in for n:

a(15) = 5 + 9(15 - 1)

a(15) = 5 + 9(14)

a(15) = 5 + 126

a(15) = 131