Please can you answer both questions

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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.

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is