IS THIS CORRECT!!!!!!!!!!!!!

 For this case, the first thing we must do is define variables.
 We have then:
 x: number of devices.
 Y: plan charge
 For the current plan we have: 
 [tex]y = 175 [/tex]
 For the new plan we have:
 [tex]y = 4.5x + 94 [/tex]
 Since we want the new plan to be smaller than the current plan, then we have:
 [tex]175\ \textgreater \ 4.5x + 94 [/tex]
 From here, we clear the value of x:
 [tex]4.5x \ \textless \ 175 - 94 x \ \textless \ 81 / 4.5 x \ \textless \ 18[/tex]
 Answer:
 x <18
 Note: The graph is correct