Here's our equation.

We want to find out when it returns to ground level (h = 0)
To find this out, we can plug in 0 and solve for t.


So the ball will return to the ground at the positive value of 

 seconds.
What about the vertex? Simple! Since all parabolas are symmetrical, we can just take the average between our two answers from above to find t at the vertex and then plug it in to find h!

 
 
        
        
        
Answer:
DFG
Step-by-step explanation:
It is a right triangle, and so is DEF. Thus they are similar.
 
        
             
        
        
        
Answer:
but u have only provided 5 pts first give 100 pts and I will help u.
 
        
             
        
        
        
Answer:
sure!!!!!!!!!!!!!!!!!!!!
Step-by-step explanation:
 How're you doing?
 
        
             
        
        
        
5(a + 3b) = 5(9 + 3(2)) = 5(9 + 6) = 5(15) = 75