Please help me ? Please

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

Which number produces a rationale number when multiplied by 1/5

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.