Hello!
To find the circumference of a circle you do 

 where r is the radius of the circle
So we do 2

Then we substitute pi for 3.14
2 * 3.14 * 72 = 452.16 yds
Then we multiply this by 5 since he runs 5 laps
Which gives us the answer of 2260.8 yds
Hope this helps! 
 
        
        
        
Answer:
6
9
6.48
Step-by-step explanation:
this is the easiest way to solve for percentage:
 Where all the percents (except 100) would go in part
  Where all the percents (except 100) would go in part 
and the whole number would go in whole 
 Then multiply 24 × 25 ÷ 100 = 6
  Then multiply 24 × 25 ÷ 100 = 6 
 Multiply 60 by 25 then divided by 100 = 9
  Multiply 60 by 25 then divided by 100 = 9
Then for the last one 9 is what percent of 72
all we have to do is multiply 9 and then convert 72 into a decimal (0.72)
Then 9 × 0.72 = 6.48
 
        
             
        
        
        
Answer:
Step-by-step explanation:
(30*48)/100 = 14.40
48 - 14.40 = $ 33.60
48 + 33.60 = $ 81.60
 
        
             
        
        
        
3a + b × a - b would be 3a² + ab + 3ab + b² = 
3a² - 4ab - b² aka B.