Help plz I don’t understand

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

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?