The domain and inverse of the function
 is
 is
Domain =  ,
, 

What is a function?
A function from A to B is a rule that assigns to each element of A a unique element of B. A is called the domain of the function and B is called the codomain of the function.
There are different operations on functions like addition, subtraction, multiplication, division and composition of functions.
The given function is 

r(x) is not defined if x - 4 = 0 
r(x) is not defined for x = 4
Domain =  ,
, 
Where  is the set of all real number
 is the set of all real number
Let r(x) = y

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To learn more about function, refer to the link:
brainly.com/question/22340031
#SPJ4
 
        
             
        
        
        
You can use 
Sine25=9/c
Or
Sin25/9=sine 90/c
        
             
        
        
        
degree to radian = angle in degree * pi/180
rad = 150 * pi/180 = 2.618 radians
 
        
             
        
        
        
Mode: 3 as it comes up the most