How many different groups of 3 students can be chosen from a class of 15 students?

What 2 forces allow things to fall ‍♀️‍♀️

If the measure of xyz is 81 what is the measure of yz

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.