Help me, please! I don't know how to do this! :(

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

Find the value of x for which abcd must be a parallelogram -9-6x x-30

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?