Answer:
See below 
Step-by-step explanation:
Area of parallelogram = base * height 
 
        
                    
             
        
        
        
For this case, the first thing we must do is define variables.
 We have then:
 x: number of minutes
 y: total cost
 We write the algebraic expression that models the problem.
 We have then:
 
 Simplifying we have:

 Then, by the time the cost is equal to $ 300 we have:
 
 From here, we clear the value of x.
 Answer:
 an algebraic expression for the problem is:
 
 
        
             
        
        
        
Answer:
y=4-5/3x
Step-by-step explanation:
Rearrange and simplify.