Answer:
 the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.
Step-by-step explanation:
 
        
             
        
        
        
Please find the attached diagram for a better understanding of the question.
As we can see from the diagram,
RQ = 21 feet = height of the hill
PQ = 57 feet = Distance between you and the base of the hill
SR= h=height of the statue
 =Angle subtended by the statue to where you are standing.
=Angle subtended by the statue to where you are standing.
 = which is unknown.
= which is unknown.
Let us begin solving now. The first step is to find the angle  which can be found by using the following trigonometric ratio in
 which can be found by using the following trigonometric ratio in  :
 :

Which gives  to be:
 to be:

Now, we know that and
 and  can be added to give us the complete angle
 can be added to give us the complete angle  in the right triangle
 in the right triangle  .
.
We can again use the tan trigonometric ratio in  to solve for the height of the statue, h.
 to solve for the height of the statue, h.
This can be done as:





Thus, the height of the statue is approximately, 8.45 feet.
 
        
             
        
        
        
Answer:
12977.4 or just 12977
Step-by-step explanation:
 
        
             
        
        
        
Answer:
80 cups
Step-by-step explanation:
4 x 4 =16
16x 5= 80 cups
 
        
                    
             
        
        
        
For any equation,

assume solution of a form, 
Which leads to,

Simplify to,

Then find solutions,

For non repeated real root y, we have a form of,

Following up,
For two non repeated complex roots  where,
 where,

and,
 
 
the general solution has a form of,

Or in this case,

Now we just refine and get,

Hope this helps.
r3t40