Answer:
ummmmm. I can not see the question...
 
        
                    
             
        
        
        
Cicumference =  Dπ  or  2rπ
thus if r = 2.2 
then C  = 2 (2.2)π
             =  4.4π
D is the answer
        
             
        
        
        
Answer:
Step-by-step explanation:
part a: time, student surf the internet  
part b
 
        
             
        
        
        
Answer: 7.81 feet
Step-by-step explanation:
This scenario forms a right-angled triangle where Ruby's height of 5 feet is the height of the triangle. Her 6 feet long shadow is the length of the triangle and the distance from the top of her head to the end of the shadow is the hypotenuse. 
This can therefore be solved by the Pythagorean formula:
c² = a² + b²
where ;
c = hypotenuse
a = height 
b = length 
c² = 5² + 6²
c² = 25 + 36
c² = 61
c = √61
c = 7.81 feet
 
        
             
        
        
        
Answer:
15 students
Step-by-step explanation:
25% = 1/4, so you can just do 1/4 of 60 or 1/4 * 60. 60/4 = 15 students.