Answer:
Part 1) The rate of change is  
Part 2) The initial value is 68
Part 3) The function rule to the linear model is 
Step-by-step explanation:
we know that
The linear equation in slope intercept form is equal to

where
m is the slope or unit rate
b is the y-intercept or initial value
step 1
Find the slope
take two points from the table
(0,68) and (15,85)
The formula to calculate the slope between two points is equal to
 
substitute the values
 
 
In a linear function , the slope is the same that the rate of change
therefore
The rate of change is  
step 2
Find the y-intercept
we know that
The y-intercept is the value of y when the value of x is equal to zero
Looking at the table
For x=0, y=68
therefore
The y-intercept is
 
The y-intercept is also called the initial value
therefore
The initial value is 68
step 3
Determine the function rule to the linear model

we have
 
 
substitute

 
        
             
        
        
        
It’s is 6 because I added it all up and all you have to do is division
        
             
        
        
        
Answer:
nonproportional
Step-by-step explanation:
nonproportional is what i think
 
        
                    
             
        
        
        
46 -2c
46 decreased by means 46 minus
Twice c would be c times 2