Question

Find the common difference and recursive formula

Answer 1

3)

The first term is 35 and it keeps getting subtracted by 30 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}-30$
$\sf a_1=35$

4)

The first term is 5 and it keeps getting subtracted by 8 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}-8$
$\sf a_1=5$

5)

The first term is -29 and it keeps getting added by 200 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}+200$
$\sf a_1=-29$

6)

The first term is 11 and it keeps getting added by 100 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}+100$
$\sf a_1=11$

7)

The first term is 37 and it keeps getting added by 30 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}+30$
$\sf a_1=37$

8)

The first term is 20 and it keeps getting subtracted by 6 to get the other terms so this is the common difference, so we can write:

$\sf a_n = a_{n-1}-6$
$\sf a_1=20$