Question

Write the explicit formula for the given sequence.

9, 15, 21, 27, ...
I need this done asap

Answer 1

Answer: 3(odd numbers)

Explanation:

The following are product of odd numbers that are only multiplied by 3.

Answer 2

an = 9+ 6(n-1)

or

an = 6n+3

Explanation:

9+ what = 15

15-9 = 6

15+6 = 21

21+6 = 27

We are adding 6 each time so the common difference is 6

The explicit formula for an arithmetic sequence is

an = a1+d(n-1) where a1 is the first term and d is the common difference

an = 9+ 6(n-1)

an = 9+6n-6

an = 6n+3