To find when the ball reaches the ground, you would need to find the time that gives you a height value of zero. 
Your answer would be 4 seconds
h = -16(4)^2 + 64(16)
h = -16(16) + 256
h = -256 + 256
h = 0
Hope this helps!
        
                    
             
        
        
        
The variable "x" equals 7
        
             
        
        
        
S represents the best distance from 1 and 0 to represent 33 1/3%
        
                    
             
        
        
        
1.7/1.9 = 0.894 (rounded)
        
                    
             
        
        
        
5(2)>3(1)+4
10 > 7. Is True because 10 is greather than 7. All needed to do is evaluate the x and y variables for each possibility. A, B, C D. And see if is a logical answer.
Any other combination gives you a false statement.