Answer:
the answer is b
Step-by-step explanation:
 
        
             
        
        
        
62 is the correct answer of this question 
 
        
                    
             
        
        
        
Answer:
c = 7
Step-by-step explanation:
6c = 7c - 7
Subtract 6c to both sides
0 = c - 7
Add 7 to both sides
c = 7
 
        
                    
             
        
        
        
(4/3) Pi r^3 = (1/3) Pi r^2 h
Solving for h = 4r
        
             
        
        
        
I FOUND YOUR COMPLETE QUESTION IN OTHER SOURCES.
 PLEASE SEE ATTACHED IMAGE.
 Part 1:
 we must see in the graph the axis of symmetry of the given parabola.
 The axis of symmetry is the following vertical line: 
 Answer:
 Answer:
 The height of the javelin above the ground is symmetric about the line t = 2 seconds:
 Part 2:
 we must see the time t for which the javelin reaches a height of 20 feet for the first time.
 We have that when evaluating t = 1, the function is: 

 To do this, just look at the graph.
 Then, we must observe the moment when it returns to be 20 feet above the ground.
 For this, we have from the graph that: 

 Therefore, a height of 20 feet is again reached in 3 seconds. 
Answer:
 The javelin is 20 feet above the ground for the first time at t = 1 second and again at t = 3 seconds