Answer:
the number is 4
Step-by-step explanation:
we can write this as 
x + 15 = 19
now we transpose
x= 19-15
x= 4
 
        
             
        
        
        
Her fastest change in elevation was -200 feet in 10 minutes. She was going at a rate of 20 fpm (feet per minute) compared to 15 fpm.
 
        
             
        
        
        
A line. It goes in both directions forever
        
             
        
        
        
Answer:
I am pretty sure the answer is 30 blocks :)
4 + 11 + 6 + 9 = 30 blocks