Answer:
a
Step-by-step explanation:
 
        
             
        
        
        
Answer:
120
Step-by-step explanation:
15 x 16/2 
You double 8 because your rotating around the y-axis
 
        
             
        
        
        
You cut out the question-
 
        
             
        
        
        
150
13+46= 59
59+87= 146
Round 46 to the nearest ten, which in this case would be 50 because the last number is larger than a 5. 
Then add the 1 back in to make it 150.
        
                    
             
        
        
        
Answer:
6.4 minutes, or 6 minutes and 24 seconds
Step-by-step explanation:
She is running 4 laps, so she is running 1600 meters total.  If she runs 250 meters per minute, divide 1600 by 250 to determine how many minutes it will take...
1600/250  =  6.4
Which is 6 minutes + 0.4 minutes          
*there are 60 seconds in a minute, so the 0.4 represents 40% of another minute.  Multiply 60 by 0.4 to see how many seconds this is...
(0.4)60  = 24 seconds,
So she ran the laps in 6 minutes and 24 seconds