Which of these numbers are irrational ?

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

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

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is