How would u do this w/o plugging in the numbers?

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.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Which of the following describes the symmetry of the graph of y = x3?