What is the image of line y=3x-1 transformed by a dilation with a scale factor of 2 and centered at (3,8)?

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.

How do you write something in scientific notation?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)