What's the question? there isn't enough info to help.
If a sequence terminates it is called a finite sequence
You might be thinking of "distribution" or "distributive property"
Example:
2(3x+5) = 2*3x+2*5 = 6x+10
I multiplied the outer 2 by each term inside (3x and 5)
$450 since first month was free if it wasn’t free it would’ve been $495
You would earn $33.60 of interest
Explanation: To find the interest you would multiply 210 by .08 (the percent in its decimal form) by 2 to get 33.60