Plz, help 10 POINTS! math :

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

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Ihonestly have no clue if it's each or none.