19) 15 <= 9 + 3x
15) x = 23,24,25
17) x <= 115
9) Second line
11) g > 20, don't fill in dot, any number greater than 20
1) -3 + h<= 3.4
3) No, x > -2
5) x > 14, don't fill in dot, any number greater than 14
7) k<=20, fill in dot, 20 or any larger number
(took me while to type this out lol cause on mobile)
 
        
             
        
        
        
D because its a triangle so it would be 3x but then you have to add the 4 for the longer side.
 
        
             
        
        
        
Answer:
37.5 cm
Step-by-step explanation:
See attached for reference.
let the diagonal be x, 
By Pythagorean formula:
x² = (22.5)² + (30)²
x = √[(22.5)² + (30)²]
x = 37.5 cm