<span>The rate for one unit of a given quantity is called a u</span>nit rate. 
        
             
        
        
        
Answer:
2x-8
Step-by-step explanation:
The word "from" tells you that the first part of the sentence should be at the back of the equation because you're taking from the product of 2 times a number, the number is unknown so it is known as "x."
 
        
             
        
        
        
Answer:
y =74x
Step-by-step explanation:
A proportional relationship is represented by y = kx where x is the independent variable, or input, k is the constant of proportionality, and y is the dependent variable or output.
What do we do to the values in the row for x to get the values in the row of y?
It helps to have x = 1 in this table. 
74 = (k)(1)
74 = k
 
        
             
        
        
        
The answer is D
Explanation:22.5 is how much each vaccine is and x is how many vaccines while y is the total cost and 45 is a standard fee