Help please.

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.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

What is the radius of the cone in the diagram? round your answer to the nearest whole number