The inquiry ain't just about being able to make $30 from all kinds of freelance work but specifically on paid to post forum just like here. I doubt there are any paid to post site that offer you easy possibility of earning that amount of money in just one week.You can make 30$ dollar or more than this by putting your complete efforts and time, main thing is time because without giving proper time we cannot put focus and work.
Many people earn more than this dollar and some can not put so much focus.but i cannot say that this is impossible because hard workers can earn this .