Which number is between G and K on the number line?

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?

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?