d1 = 51(t)
d2 = 71(8 - t)
d1 + d2 = 508
and now you just have to solve for t.
 
        
             
        
        
        
The answer to the question above is the third choice, "a shelf on a wall". The shelf is usually made of rectangular pieces of materials that are then connected to each other to form quadrilaterals. The sides of the shelf are planes. 
        
                    
             
        
        
        
Answer:

The above function value for  shows that height of the ball before it was dropped i.e. at time = 0 seconds.
 shows that height of the ball before it was dropped i.e. at time = 0 seconds. 
The height of the ball above the ground before it was dropped = 400 ft.
Step-by-step explanation:
Given:
The quadratic function that models the height of the baseball above the ground in feet ,  seconds after it was dropped is given as:
 seconds after it was dropped is given as:

To find  and interpret the meaning of the function value in contect of the problem.
 and interpret the meaning of the function value in contect of the problem.
Solution:
In order to find  , we will replace
, we will replace  in the given function as
 in the given function as  is a function of time
 is a function of time  .
.
Thus, we have:



 (Answer)
  (Answer)
The above function value for  shows that height of the ball before it was dropped i.e. at time = 0 seconds.
 shows that height of the ball before it was dropped i.e. at time = 0 seconds. 
The height of the ball above the ground before it was dropped = 400 ft.
 
        
             
        
        
        
How i did it: 
<span>25% is equal to 1/4 right? 20 in 4 equal parts (or 20 divided by 4) is 5. 20-5 =15 dollars!</span>