Find the common difference. same as umber 1 2.) 21, 121, 221, 321
A.) d=-98
B.) d=100
C.) d=98
D.) d=-99

B.) d = 100

You add 100 to 21, you get 121.

You add 100 to 121, you get 221.

You add 100 to 221, you get 321.

And so on-

Hope dis helps :)

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: