Write an expression to match the quotient of 42 and 2 subtracted from 34​

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Which term best describes the association between variables a and b

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.