The blue dot is what value on the number line

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.

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Could someone me with this question i’ve been stuck on it for 20 minutes