Answer:
Please solve these questions I am hella desperate rn
Step-by-step explanation:
 
        
             
        
        
        
Start by mult. both 0.4 and 5.12 by 100.  What is 40 divided by 512?
        ___.078_______________
512 /  40.000
           3584
          -----------
             4160
             4096
           ---------
                 64              and so on.   Calculator answer is 0.078125.
        
             
        
        
        
Answer:
72 ft
Step-by-step explanation:
Here, we want to get the maximum height the ball will reach
the maximum height the ball will reach is equal to the y-coordinate of the vertex of the equation 
So we need firstly, the vertex of the given quadratic equation 
The vertex can be obtained by the use of plot of the graph
By doing this, we have it that the vertex is at the point (3,72)
Thus, we can conclude that the maximum height the ball can reach is 72 ft
 
        
             
        
        
        
2.1 is already in a decimal form. 
Hope I helped! 
 
        
             
        
        
        
Answer:
x=9
Step-by-step explanation:
Add similar elements: -5x+3x=-2x
-2x+15=-3
Subtract 15 from both sides
-2x + 15-15=-3-15
Simplify
-2x=-18
Divide both sides by -2
-21/-2 = -18/-2
Simplify
x=9