1.40 less than or equal to 5.60

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?

Determine the relationship of ab and cd given the following points

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles