Please help its my final!!
also if you can provide steps how you done it can be really helpful

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?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Pranza plotted point a in the coordinate plane below.