Can someone please explain how to do this?

A) x<0

Step-by-step explanation:

Here's how I think of it:

"x" can be any number right? what the graph is saying is that x can be any number on the blue line.

What's important to notice is that the circle at 0 is not colored in. This means x can be everything up to 0... but it cannot be 0. For example, x can be -0.0001 because that is less than 0.

In total, x can be anything less than 0, it just cannot be 0.

Therefore, x<0

50- 250 is correct i did that one too

step-by-step explanation:

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)