Answer:
49
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
you would need just 4 equation
 
        
             
        
        
        
Answer:
Order is 6
Step-by-step explanation:
The population of Portland Oregon has recently grown to more than 500,000. 
The order of magnitude for the number of people in Portland means the power of 10. It means that we need to write 500,000 in form of 10 to the power. So,

It contains 6 zeroes. It means,

So, the order of magnitude for the number of people in Portland is 6.
 
        
             
        
        
        
Chris is going 10 mph. After 9 hours, Chris has gone 90 miles. Elena is going 14 mph. After 9 hours, she has gone 126 miles. 126 miles is 36 miles more then 90 miles. 
