Please help(the part cut out says) Explain​

What is the length of the unknown leg in the right triangle ?

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.

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1