DeWitt made muffins to sell at the school bake sale. In the morning, he sold 15 of the muffins he made. In the afternoon, he sold 23 of the muffins that remained. At the end of the sale, 16 muffins were not sold. How many muffins did he make?

Just tell me how to set up the equation.

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.

Ineed to know the answer to this algebra question.