Need help plz thank u have a blessed day

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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.

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5