Hey please help me with math (who doesn't know Latvian here is translation on what's asked: Division into square trinomial multipliers (if possible))​

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.

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.