Explanation:
The formula isnt correctly written, it should state:

You have to start from
and end in a³+b³. On your first step, you need to use the distributive property.

This is equal to

Note that the second term, -a²b, is cancelled by the fourth term, ba², and the third term, ab², is cancelled by the fifht term, -b²a. Therefore, the final result is a³+b³, as we wanted to.
I believe the answer to be only sequence A.
-Hope this helps, have a nice day! :)
Answer:
( 15m + 31 ) / ( m + 10 )
Step-by-step explanation:
add like terms
m + 14m = 15m
( 15m + 31 ) / ( m + 10 )
The radius of the circle is y=-25/14