What is the explicit formula for this sequence 2,6,18,54,162

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.

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

What percent of 18 is 24? and plz explain thx.