Yesterday, your checking account statement showed a balance of $17.Your friend paid back $30 today. What is your balance now?

The $30 your friend paid back will go into the checking account, so the balance will increase by that amount. Therefore, your balance will be $17 + $30 = $47.

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

i think the answer is d im not sure