Question

Write down in terms of n an expression of the following sequences

a) 12 10 8 6 4
b) 25 20 15 10 5​

Answer 1

`-2n+14`

`-5n+30`

Explanation:

-2 difference.

`u_(n) =-2n+c`

`u_(1) =-2(1)+c=12`

`c=14`

-5 difference.

`u_(n) =-5n+c`

`u_(1) =-5(1)+c=25`

`c=30`