can someone help me with this it's for my sister's math class she won't believe me until I ask someone I told her the answer was 544.32

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

In the geometric progression –3, 12, −48… what term is 3,072?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.