Whay are the domain and range of f(x)=logx-5

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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.

Me find the value of x each figure.