What is the equivalent ratios of 11 to 6

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

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.

9/10 divide by -3/15 as a mixed number