Please awnser this im stuck

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

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.