Ashley posts 17 status updates on her facebook wall each day . roberto posts 21 status updates on his facebook wall each day .

part a : define each variable and write an algebraic expression to describe the combined number of posts for ashley and roberto after any given number of days

part b : write an algebraic expression to describe the difference between number of posts for ashley and roberto after any given number of days .

Let x be the number of days.  

If Ashley posts 17 status updates each day, then after x days Ashley posts 17x status updates.

If Roberto posts 21 status updates each day, then after x days Roberto posts 21x status updates.

Part A. The combined number of posts for Ashley and Roberto after x days is:

17x+21x.

Part B. The difference between number of posts for Ashley and Roberto after x days is:

21x-17x.

answer: idk

step-by-step explanation: