Answer: it's the last 
Step-by-step explanation:
 
        
             
        
        
        
The answer is c 
Because if it takes 50 minutes to run 4 miles you need to divide 50/4 and you will get 12.5 and then multiply that by 30 cause she is trying to run 30 miles and that will get you 375 and then divide that by 60 cause their are 60 minutes in a hour and you will get 6.25
        
             
        
        
        
3•2=6. When you square 6, you get 36. Add 5x to that. 5x=15. 36+15=51
Cassie read 155 pages one day, and we need to find the unknown value of “x”. All you have to do is add 155+x=325.
 
        
        
        
She would have a total of 40 stamps.