Answer:
 D)graph c
Step-by-step explanation:
it's my opinion do not take it as important
 
        
             
        
        
        
Answer:

Step-by-step explanation:
cot(-11pi/6)=cot(-pi-5pi/6)= -cot(5pi/6)=cot(pi/6)= ≈1.73
≈1.73
 
        
             
        
        
        
Answer:
C
Step-by-step explanation:
-1.5x=-2.55
1.5x=2.55
x=2.55/1.5
x=1.7
 
        
             
        
        
        
it is a rational number  (intergers are  plus and minus whole numbers)