Help me please I’m confused.

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.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels