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

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional