2 1/2 feet can be written as 2.5 feet.
 Divide the total distance by the distance per second:
15.6 feet / 2.5 feet per second = 6.24 seconds.
 
        
             
        
        
        
Answer:
X*6
Step-by-step explanation:
The virus (x) time 6
 
        
             
        
        
        
Let x be the number of children
Let y be the number of adults
x + y = 4
4x + 7y = 19
        
             
        
        
        
Yo sup??
the answer to this question is 1/2
by applying 
lim sinx/x=1 and
just apply the property 1-cosx=2sin²x
Hope this helps