1/10,000 as a power of 10

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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.

Hi, can anyone show me how to do this problem? 100 points for this. in advance