Find the rate of change of the linear function shown in the graph. Then find the initial value. the rate of change is? the initial value is?

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?

Will give brainliest if you answer question correct

What is the range? can’t seem to find it out